I am in the process of splicing the wires on the harness for my 1999 f-150.My question is where is a good spot near the radio opening to hook up the ground wire. I see lots of bolts but none that have direct contact to metal. Also, my neighbor gave me a test light to use for finding the ground wire in the factory wire harness. Which location is it on the harness and also do i test for this in ACC and on position of the ignition? Thanks for your help.

 

Just go buy an $8 harness adaptor from walmart!

 

go to best buy or some audio store and ask for the wire harness for your truck. dont cut the factory plug!!

 

NEVER cut the plug off! a wiring harness plug in is $10 at ANY car audio store!
It wires up COLOR for COLOR and makes it idiot proof!