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Standard Ignition RY-1666 Diesel Glow Plug RelayOE Quality 60-Day Returns
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Part #: RY-1666

Standard Ignition RY-1666 Diesel Glow Plug Relay

⚙️ 4 vehicles fit this part
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Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$96.35Free 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.
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✅ 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: GMC, Sierra 2500 HD
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
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Standard Ignition RY-1666 Diesel Glow Plug Relay
BrandStandard Ignition
Part NumberRY-1666
Connector GenderMale
Connector Quantity4
Connector ShapeSquare
FunctionsRelay
Mounting Bracket(s) IncludedNo
Terminal GenderMale
Terminal Quantity4
Terminal TypeBlade terminals
Voltage12

This part fits 4 vehicles. Search below:

YearMakeModelFuel TypePositionNotes
2004GMCSierra 2500 HDDIESELN/ARelay Only
2003GMCSierra 2500 HDDIESELN/ARelay Only
2002GMCSierra 2500 HDDIESELN/ARelay Only
2001GMCSierra 2500 HDN/ARelay Only

* 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:

1R20782073556-242760110071904-10097371492AR7170R7169RAA2671

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.