Proper way to run head unit and GPS off the same accessory wire???

[wmflyfisher 10+ year member]

I'm in the process of hooking up my Pioneer double din and hard wiring my GPS. The wiring harness on my 08 Silverado requires me to run a dedicated accessory wire for my head unit. I found a switched (unused) spade under the column that I plan to run this wire to.

I'm also hard wiring my GPS and it will require a 12V (cigarette) outlet somewhere under the dash. Can I run the hot wire from the cig outlet and the head unit together to the same switched spade? If so, do I need to add a relay or anything??

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[keep_hope_alive Premium Member]

if you get the proper GMOS adapter to interface with the Class II data Bus - your problem is solved and you prevent a multitude of issues.

yea, you can power the GPS and the HU from the same ignition source.

 

[Sleeklsc 5,000+ posts]

When I hardwired my gps I bought a 10a "Add-a-fuse". If you're not familiar it's a plug that piggybacks off a fuse location in the fuse box. It's good if your running multiple accesories and if you want a dedicated fuse for the "extra's".

P.s. Just make sure you don't just chop the wire off and wire it in directly. Gotta tap into the + and - at the the cig jack plug for the gps. I made that mistake in my younger days and fried a radar detector.