O/T 1990 F150

John B.

Well-known Member
About a month ago some of you may remember that I posted a message asking for some advice on my F150 on why it would die while driving along then 5 minutes later it would start back up. Well I narrowed it down. I found when I popped open the engine hood or closed it I could hear the fuel pump kick on (when the key was on of course) I then looked for a pinched wire but what I found was a small loose bolt that had two ground wires on it. The two wires came out of the main harness just behind and above the passenger side headlight. The screw was backed out half way. It was located by the battery on the passenger side close to the negative battery terminal. I jiggled the wires and sure enough I heard the fuel pump turn on. I added a ground wire from the battery's negative post to the other two wires on the bolt. It's been running trouble free ever since.

The ground wires were the ground for the fuel pump relay and I believe the ignition system.
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When you posted before, did anyone suggest checking the grounds? (Trying to remember.)
 
No one mentioned a ground, after replacing a few electrical items I knew from experience it was going to be something simple.

I got a buddy now that his son has a GMC truck and when he appllies the brakes all his dash lights come on. I told him to make sure they have the correct bulb in the rear lights. A sinle filament bulb can cause that.
 
someone messed it up in the past,,, the ground wires are spose to B hooked directly to the neg. battery cable,,, I have had a few kick my butt cuzz of a bad ground at the neg cable
 

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