Installed new headunit/sub in mustang and now headlights are stuck on. HELP!

[tylerjford]

So I installed a new headunit and a subwoofer in my 2003 mustang cobra and when I was finished the Headlights were stuck on in the car with the keys out of the ignition, I unhooked all the wiring harnesses and removed the amp power from the battery and it didn't solve anything, did anyone ever see this problem before? any suggestions?

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[audiobaun 5,000+ posts]

Not the head lights, but I had an Issue with the Windshield wipers in a 98 mustang GT..Have you tried to unhook the battery for about 5min, and then hook it back up,to try to reset the memory??That worked for me

 

[tylerjford]

Yeah I have to unhook the battery when I park now otherwise it

Will go dead lol so nothing was reset.

 

[SplAffair 10+ year member]

did you purchase an aftermarket radio harness?

 

[CrossoverOre 10+ year member]

try unplugging the harness going to the headlight switch. Its possible the switch is bad.