[Jim '57]

I have two light gauge wires from ECM for backup lights and don't know how they should be wired. Do they require a relay?
Thanks,
Jim

 

[finallyhavea57]

I don't know Jim, but glad your posting.

Don

 

[Rick_L]

If the wires go through the ECM, I'd put them on a relay.

The T56 has a reverse switch on it, you don't need to go through the ECM. And maybe yours is that way, but just bundled into the harness.

 

[Chevynut]

If the wires go through the ECM, I'd put them on a relay.

The T56 has a reverse switch on it, you don't need to go through the ECM. And maybe yours is that way, but just bundled into the harness.

I agree....I'm using the T56 switch. You don't need a relay for it. I don't understand why you'd need to go through the ECM either. Why would the engine need to know when you're in reverse?

 

[Jim '57]

Thanks for the responses and I'll take the harness apart to see if they are just bundled with the wires from the ECM and really originate at the trans.
Jim

 

[Reaper]

It doesn't go through the ecm. Just run a fused power wire to it then run a wire to the lights.