Ok so now i'm adressing my electric problems on my 88 F150, I had 2 bad fuses, now replaced.

Now if I open the door and step on the brake pedal, the buzzer buzzes.

When the door is closed, when I put my left turn signal, the buzzer buzzes with the flasher! So does the dash cluster light, and 5 roof cab lights and the right turn signal flashes also, but pretty dime.

There has been one hellava electrical job done on this truck, but acually begining to think it should be fine....


Could this be a messed up fuse box? Or probably not grounding well or what?

 

Wow that's...interesting. Sounds like my friends truck whose radio turns on when he turns on the parking lights (with the key out). Let me dig up the electrical schematic and see if we can pinpoint the common parts in all them circuits.

 

This looks like the main diagram you need: (sorry, I know it's big but then it's readable)



Here's the Brakes:


Marker Lights:

 

i think your lost John lol.
here's the section of the forums that id try:
1987 - 1996 F150 & Larger F-Series Trucks - Ford Truck Enthusiasts Forums

 

What the heck? I did post this in the 87-97 F150 forum? Wtf happened?


Can one of you mods move this for me?


Sorry about that?

 

I'd check all the grounds. Funny things can happen if they're messed up, stuff will try to find a path to ground, and may end up backfeeding other circuits.
Since you're worried about the fuse panel, take a close look at it and make sure nothing is melted or crispy looking.

 

Sure sounds like a ground issue to me!

 

Yeah I'm leaning towards a ground issue as well at this point. Following the schematics I'm not seeing anything staring at me off the bat. Primary one to check would be the firewall to engine ground by the wiper. Hey I've burned one of them up before too! Except in my case that was how I found out the previous owner changed the battery ground from the engine block to the core support. Was trying to crank that 5.8L gasser over using that teeny 8 gauge body ground!