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WAIPart #: 12278N
WAI 12278N Alternator
⚙️ 10 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$168.76Free 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: Mazda, 626, B2000, and RX-7
🔄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 Alternator options
WAI 12278N Alternator
| Brand | WAI |
| Part Number | 12278N |
| 12 | 12 |
| Fan Type | External |
| Pulley Included | Yes |
| Family | Hitachi |
| Pulley Groove Quantity | 1 |
| Pulley Belt Type | V-belt |
| Regulator Type | Internal |
| Decoupled Or Clutch Pulley | No |
| Amperage Rating | 50 |
This part fits 10 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1984 | Mazda | B2000 | N/A | |
| 1983 | Mazda | B2000 | N/A | |
| 1983 | Mazda | RX-7 | N/A | |
| 1982 | Mazda | 626 | N/A | |
| 1982 | Mazda | RX-7 | N/A | |
| 1981 | Mazda | 626 | N/A | Mitsubishi IR/EF, 55A |
| 1981 | Mazda | RX-7 | N/A | Mitsubishi IR/EF, 55A |
| 1980 | Mazda | 626 | N/A | Mitsubishi IR/EF, 55A |
| 1980 | Mazda | RX-7 | N/A | Mitsubishi IR/EF, 55A |
| 1979 | Mazda | 626 | N/A |
* 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:
122781360815143071480-18-3003068340312281058120034708173-18-300B8341-18-3008356-18-3008574-18-300943356927010A002T21278A002T23471A002T23477A002T31677A002T40377A003T21277A003T21278A003T21677A003T33977A003T34077A005T20374A005T20374XA005T20377GD207976-AHE19-18-300HE19-18-300AHE21-18-300HE21-18-300AHE26-18-300HE26-18-300AHE41-18-300HE41-18-300RHE45-18-300LR150-165N221-18-300N221-18-300BN221-18-300R00
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.