One more harness chop question

[Bumble-Ski]

This is a pretty robust AEV 7000 lighting harness. I have AUX...

This does not seem to be as straight forward as cut all but power and ground (or is it??)

#4 is pig tail to two aux lights
#5 is the switch that I plan to cut shorter and use on AUX. Has red, white, black...
#1,2,3 are between the aux lights and switch.

My concern is if I just cut relay, ground, and fuse that I’ll mess up the whole wiring harness.

Thank you for continued guidance!

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[kevman65]

Right around the 4:40 mark gets into what you're asking about.

 

[Mr._Bill]

Trace the three wires from the switch with a meter. One should be a feed from positive, one should be a negative (for the light inside the switch), and the other should be the line to activate the relay. Disconnect the positive and negative wires from the switch and tape them up. Connect the line to the relay to the AUX switch. Then just connect the main harness positive and negative, and plug in the lights. The AUX switch will trigger the relay and turn the lights on. This is the least effort and no hacking up the harness. The demand on the AUX circuit is minimal, since it is just triggering the relay, and the lights are fed off the harness connection to the battery.

But it actually is fairly simple, if you want to hack up the harness. As long as the demand from the lights does not exceed the capacity of the AUX circuit, just connect the positive for the lights to the AUX switch and ground the negative to the frame. Use just what is needed out of the harness to plug in the lights.

 

[Bumble-Ski]

Right around the 4:40 mark gets into what you're asking about.

Awesome, thank you. I’ll watch this!

 

[Bumble-Ski]

Trace the three wires from the switch with a meter. One should be a feed from positive, one should be a negative (for the light inside the switch), and the other should be the line to activate the relay. Disconnect the positive and negative wires from the switch and tape them up. Connect the line to the relay to the AUX switch. Then just connect the main harness positive and negative, and plug in the lights. The AUX switch will trigger the relay and turn the lights on. This is the least effort and no hacking up the harness. The demand on the AUX circuit is minimal, since it is just triggering the relay, and the lights are fed off the harness connection to the battery.

But it actually is fairly simple, if you want to hack up the harness. As long as the demand from the lights does not exceed the capacity of the AUX circuit, just connect the positive for the lights to the AUX switch and ground the negative to the frame. Use just what is needed out of the harness to plug in the lights.

Thank you! I’ve reread your note a few times. You make it seem/sound easy!

 

[Mr._Bill]

Thank you! I’ve reread your note a few times. You make it seem/sound easy!

It's not really difficult. It just depends on which route you want to take. The AUX circuit includes a fuse and relay, so the one in the harness is not necessary, but few vehicles come setup that way. Some hack up the harness for simple and minimal wiring, but a little more effort to install. Others do the minimal change and use the harness to keep the install as quick and easy as possible. Just make sure you don't cause a short circuit anywhere.

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