The truck has it's 4th starter relay in less than a year. I just put a new one on this morning and the truck still won't start. I was able to jump it off the starter relay and it ran fine, but after it sits for a few minutes, it won't crank, start, nothing, and I have no power inside the cab. What could be causing this problem?
You have a bad connection. It will pass enough current to keep things running, but the starter load is causing it to burn the spots that are making contact.
I had this same issue with my '86 F-150, and the final solution was to replace the all the heavy cables: battery to solenoid, solenoid, to starter, and block to battery ground. Thoroughly clean the block where the negative cable connects, and the battery terminals.
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does the engine turn or does the start just engage when you say clicked real fast makes me think its the starter have you checked all fuses have you checked to see if its getting fuel is it getting fire from plugs
Possible but not likely. Double check your alignment of the solenoid and starter to make sure you don't have a bind in them. This sometimes happens when Dirt and gunk get in the way of getting it tightened down into the mountings correctly. When you tighten it down it feels right but you actually end up with a gap or spacing which leads to binding on the starter gear when it locks into the Flywheel.
when looking at it from the front the most left is from the battery, now going right from there the little pin is from ignition, basically to flip this giant switch on. next little pin goes to your fuel shut off relay, it will turn on that relay to send power to your pump while cranking, next is the large out. far right. that goes to your starter.
2 problems, first you have bad starter or starter relay for starter staying engaged, keep alt plugged in has nothing to do with starter staying engauged, to test starter relay, jump at relay bat + post with red/bk wire on solonoid, if cranks over without staying engaged, then not relay or starter but rather in your ign switch, ford had bad problems with ign switch some years ago doing that
The starter is the next logical choice to swap, but make sure that you have checked all of the connections on your battery and solenoid, and that your charging system is working well enough that your battery is fully charged. If you pull on your head light switch, and then try to start the car, the lights should dim a bit, but not go out. Anyway, back to your starter. Remember to disconnect the negative terminal of your battery first. All it takes to change the starter is to disconnect the nuts that hold the wiring first, then take out the bolts tht mount the starter to the engine bell housing. Reverse the process to install, and hook up the battery terminal last....