Head Unit installation issue (12V ignition)

[SamCSF556]

Recently got a aftermarket head unit for my 07 GMC Canyon. During the installation I had to splice the ignition wire into another wire that had 12V during ignition. Decided to splice into a wire from the AC unit. This worked out and everything seemed fine until I tried using both the AC and head unit at the same time. The head unit shuts off completely when the AC is at a specific power but works fine when it is off. This was my first time ever doing electric work and don’t understand what is causing this or how I can fix it . Is there a possibility I can get it to work in its current set up, or am I best off just splicing into something else instead. Any help is appreciated.

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[Jimi77 Premium Member]

Probably a voltage drop. Why didn't you use the ignition from the old HU. Why did you splice into anything when there a cheap plug and play adapters available?

 

[winkychevelle 10+ year member]

You learned why they make adapters and why they cost what they do. Run a relay off that wire then to the radio using the radios power wire to supply power to the radio not the ac turn on wire

 

[SamCSF556]

Probably a voltage drop. Why didn't you use the ignition from the old HU. Why did you splice into anything when there a cheap plug and play adapters available?

I don’t think the old HU had an ignition? I at least wasn’t able to figure out what it was and another forum I used said I would need to connect the red wire (ignition) to a switched power source. I didn’t use an adapter because I’m an idiot and didn’t do any research into this. Thanks for the reply. I will also attach the image I used to connect all of the wires.

 

[SamCSF556]

You learned why they make adapters and why they cost what they do. Run a relay off that wire then to the radio using the radios power wire to supply power to the radio not the ac turn on wire

I’ll look into that. Thanks for the reply.

 

[winkychevelle 10+ year member]

I’ll look into that. Thanks for the reply.

Your factory unit doesn't have an ignition it uses the can bus to turn on and off. Do not tie into the canbus and try and use that. If anything grab an ignition fuse under the hood.

 

[Jimi77 Premium Member]

Your factory unit doesn't have an ignition it uses the can bus to turn on and off. Do not tie into the canbus and try and use that. If anything grab an ignition fuse under the hood.

Thanks for the clarification. Fuse boxes generally have some blank spots you can tap into.