| Basic 2 and 3 Wire Systems |
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2 Wire System
- Are vehicles that have the turn signal and brake lights operating
on the same bulb and wire.
- Up to 7.5 amps per circuit (per SAE specifications).
- It will have an electrical code of "A" in the paper catalog.
3 Wire System
- Are vehicles that have the turn signal and brake light use different bulbs and wires.
- Up to 4 amps per circuit (per SAE specifications).
- It will have an electrical code of "B" in the paper catalog.
Estimating Trailer Amperage Per Circuit:
| Stop-Turn Lights |
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2 Amps each |
| Taillights |
|
1 Amp each |
| Clearance and Marker Lights |
|
1/2 Amp each |
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NOTE: For estimating use only. Amperage is rounded to the nearest whole value and may not apply in all cases.
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