The thick yellow wire is the +12V constant power. The red is the +12V ignition hot wire. The black wire is the ground.
Hope that helps.
It was easy enough to figure out what MOST of the wires are, but there are still a few shown that are not described. So far the manual and this site list the following:
Green/Black - Rear Left Negative
Green - Rear Left Positive
White - Front Left Positive
White/Black - Front Left Negative
Purple/Black - Rear Right Negative
Purple - Rear Right Positive
Gray - Front Right Positive
Gray/Black - Front Right Negative
Light Green - Reverse Gear
Orange/White - Illumination
Pink - Attenuator
Brown - Remocom - This is for steering wheel control
Blue - Antenna Turn On
Light Blue - Hand Brake
Blue/White - Amplifier Turn On
Red - Accessory
But where is the ground? Also what is the thick yellow wire in this picture?
My GMOS-LAN-06 harness is looking for a yellow 12v constant coming out of the G4, but I didn't want to assume that just because there is a yellow wire it is what I was looking for. Attached is the .pdf for the harness is that is helpful.
Thanks Rip, that's what I assumed...but you know what they say about when you assume. Odd that they left that out of the latest draft of the manual.
Next time you find a problem with the Manual - please post it in the thread where I've posted the manual and asked for feed back.
It's easy to skip over those wires because they are the same for EVERY head unit on the market and is considered a standard.
Manual has been updated.
I know this is an old thread, and I am not too optomistic that anyone will respond...but just in case. What do I do if the [Ford] factory "yellow" wire is much thinner than the thick yellow one on teh G4 harness? Th emanual says
Do I just buy some thicker wire and connect it straight to my battery?Yellow – Power. This wire must be
connected to the battery in the car.
Do NOT splice this wire into a wire of
a smaller gauge. Doing so will risk
the unit not operating properly and
could cause an electrical fire. If the
wire in the factory harness is the
EXACT same gauge as the wire on
the G4 harness, splicing into it will
Although the yellow (constant) should not be taking much current - it is only for memory, clocks etc.