1977 F100 302, auto, basket case.


I'm starting to put the truck back together. Today I started the truck for the first time with no vacuum leaks in about two years.
I do not have installed yet-radio, dash cluster, rear lights (disconnected at rear harness)


Fuse box-instrument panel fuse does not have power on either side-not sure if this relates to my problem or not.


While putting the truck back together, I cleaned all grounds to metal and applied dielectric grease on every connection I put together.


I have grounds:
from the engine block to the cab
battery negative to the firewall
battery to the radiator
battery to the engine block




I have headlights. Taillights are disconnected.


When I start the truck I everything is out of wack in terms of the signals, flasher, markers. Everything is doing what it should not be.


I can explain, but I think I need a better handle on this. Is there a procedure to test the signal switch? Or a test to see if I have proper power coming into the signal switch from the connector under the cab?


I have tested the signal switch with a test light and they all 6 have power at various times.


I know everyone says grounds, but I think I am good with grounds. Does the fact that the inst. panel does not have power have something to do with this?


Thanks

 

In my trucks, the turn-signal indicators and flashers get all goofy if I've got a light burned out. The system needs to be complete to close the circuits and keep the resistance right. Not sure this applies in your case, but with your rear harness being disconnected, maybe it does

 

I will connect it, I was trying to limit the possibilities.

 

I figured I should post the conclusion in case someone reads this later.


I discovered my headlight switch was bad-therefore the instrument panel fuse had no power until this worked correctly.


I hooked up the rear lights (flareside-so they were resting on the gas tank-no bed installed yet) with what I thought was grounded because the tail lights went on. I lifted them up and they went off. So I thought I had ground. The flashers and signals were flashing alternately. Then I properly grounded the rear lights and all worked as it should.


So Grounds and a complete system are a must.


PapaBearYuma-thanks