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DormanPart #: 645-903
Dorman 645-903 Headlight Switch Connector
⚙️ 183 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$97.11Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship
Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Cadillac, Chevrolet, and GMC, Astro, C1500, C1500 Suburban, C2500, C2500 Suburban, C3500, Escalade, Express 1500, Express 2500, Express 3500, G30, G3500, K1500, K1500 Suburban, K2500, K2500 Suburban, K3500, P30, P3500, Safari, Savana 1500, Savana 2500, Savana 3500, Tahoe, and Yukon
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? Click here for all Headlight Switch Connector options
Dorman 645-903 Headlight Switch Connector
| Brand | Dorman |
| Part Number | 645-903 |
| Wiring Harness Length | 16.4 |
| Wire Gauge Measurement | 10 |
| Terminal Type | Blade |
| Wire Quantity | 12 |
| Terminal Gender | Female |
| Package Contents | 1 harness |
| Terminal Material | Tin brass (tin plate) |
This part fits 183 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2003 | GMC | Savana 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2003 | GMC | Savana 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2003 | GMC | Savana 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2002 | Chevrolet | Express 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2002 | Chevrolet | Express 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2002 | Chevrolet | Express 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2002 | GMC | Savana 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2002 | GMC | Savana 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2002 | GMC | Savana 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2001 | Chevrolet | Express 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2001 | Chevrolet | Express 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2001 | Chevrolet | Express 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2001 | GMC | Savana 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2001 | GMC | Savana 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2001 | GMC | Savana 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | Cadillac | Escalade | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | Chevrolet | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | Chevrolet | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | Chevrolet | Express 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | Chevrolet | Express 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | Chevrolet | Express 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | Chevrolet | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | Chevrolet | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | Chevrolet | Tahoe | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | GMC | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | GMC | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | GMC | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | GMC | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | GMC | Savana 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | GMC | Savana 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | GMC | Savana 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 2000 | GMC | Yukon | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Cadillac | Escalade | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | Astro | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | Express 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | Express 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | Express 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | P30 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | Chevrolet | Tahoe | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | P3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | Safari | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | Savana 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | Savana 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | Savana 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1999 | GMC | Yukon | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | Astro | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | Express 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | Express 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | Express 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | P30 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | Chevrolet | Tahoe | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | P3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | Safari | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | Savana 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | Savana 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | Savana 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1998 | GMC | Yukon | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | Astro | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | Express 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | Express 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | Express 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | P30 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | Chevrolet | Tahoe | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | P3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | Safari | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | Savana 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | Savana 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | Savana 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1997 | GMC | Yukon | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | Astro | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | Express 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | Express 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | Express 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | G30 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | Chevrolet | Tahoe | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | G3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | Safari | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | Savana 1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | Savana 2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | Savana 3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1996 | GMC | Yukon | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | Chevrolet | Tahoe | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | C1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | C1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | C2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | C2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | C3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | K1500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | K1500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | K2500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | K2500 Suburban | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | K3500 | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
| 1995 | GMC | Yukon | N/A | 12 Way Female w/Leads; w/Dimmer Switch |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
121671551P1266634PT5734PT819S-800
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.