1987Stevo

No I don't have any LED lights on the truck. I think i t may be that gem box though because my dad was using the truck

He said he had the a/c going with the blower on and the window worked (sometimes it Doesnt roll down)
Then he said he shut it off and went to turn it back on it didn't work so I am leaning more towards that box I will look at it this weekend

1987Stevo

I looked at the truck today.
I am ordering a new blower motor relay. It does effect my lighting problem so I am going to get a new one and see if it fixes it.

Right now if I plug in the relay it buzzes and clicks every time it clicks my lights get brighterfor a second.

I will keep you guys posted

1987Stevo

Okay so I finally got an update

We got a new gem unit and problem is still the same. The gem came out of a working f-150.
Now one thing I noticed is my guage lights don't ready dim and when I click the dimmer to max my indicators for the blinkers and high beams go away.
Also if the dimmer is not clicked to max and the indicators are on if I open the door it fixes the problem

With the blower motor that still does not work I get a buzzing noise from one of the relays. More specifically the black one next to the blue flasher for the blinker.

Sunday I am going to pull out the cluster and look at the wiring and connections any other ideas? Wiring doesnt looked to be cut up or anything from the alarm system that was in it

1987Stevo

Also another thing I just found out is when the blinker blinks the volt meter on the dash moves up and down with the blinks.

When I put the blower motor on for the ac a relay buzzes and also the volt meter goes up slightly. I am going to trace the volt meter wire see if their is something tapped off of that

RangoWA

One thing to do is replace, or switch around for a test, the relays in the fuse box.

1987Stevo

Which fuse box under the dash by the pedals or under the hood?

1987Stevo

Fuses and relays are all good sometimes the fog lights come when I put the parking lights on. Can it be the main light switch bad ?

1987Stevo

Okay so another update here.

I took the multifunction switch apart had garbage all over the copper connections. I cleaned them really good reinstalled the switch.

. Nope didn't solve my problem just made the indicators now bright instead of dim.

I did manage to narrow it down tho. Its something from the blower relay and the flash relay wiring. I started taking the dash apart from the passenger side.

None of the plugs or connections effect the problem on the top of the dash. Is there anything between the driver and passenger side where theirs wires connect to a plug or something ?

I am at a complete loss right now... I did dream of burning the truck last night also haha

1987Stevo

One final thing I just looked at which could be the problem.

Every time I turn on the parking/headlights my lights for the window switches and door locks light up every time I turn off the lights and turn them on they come on as well.

Warspite

Do you have the headlight switch that has the "Autolamp" feature? High failure item, since it has circuitry in the module that freezes - or just burns out. I've replaced mine twice in 14 years - as stupid things were happening - cab lights would never come on, regardless of door position, dash lights out, headlights that would never turn off, etc.