1977 E-150 will not cank
EDIT: Thanks Ford390Gashog, of course I had to think of the hardest possible way to test the solenoid...

Hey, it's been a long day under the hood for me... My brains not quite up to par at the moment
Last edited by ihateminimumwage; Apr 25, 2007 at 06:51 PM.
Hope it helps
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start with mechanical
Does engine turn over with a breaker bar and socket ?
Battery fully charged ?
Check all cable grounds and component grounding.
Procedure:
Disconnect wire connector to S terminal on starter relay.
Attach test light to disconnected wire connector
Turn key to Start ...does Test light Illuminate ?
If no, Problem with power to switch in wire harness or from ignition switch to connector
If yes,Try what I posted above in Post #11.
Does engine crank now ?
If no,
problem is in relay (starter solenoid switching circuitry)
Or starter is seized.
If yes,Relay is good and Problem is in wiring from switch to solenoid.
Dig the analog meter's leads into the tops of battery's posts. (not the clamps!)
~12 volts
Have someone try to start it while you watch the meter's needle.
a) started fine... the meter's needle dropped to no lower than 10 volts.
b) didn't start... voltage went to zero or close to it
c) didn't start... meter stayed steady at ~12 volts
a = better if it only dropped to 11 volts :) should be reading like 13 volts while running and when the engine is reved over 13 volts. if so, everything is fine.
(if you have a meter and hadn't done that before... do it while you're vehicle is working fine so you can see it for yourself... write down the numbers in your shop manual if you want to. :)
b = dead battery
c = open circuit somewhere
Cheer up, "opens" are easy to find with a meter, be glad it ain't a short circuit ok? :)
IME most of the time starter-circuit "opens" are the wire-connection-part of a cheap replacement bolt-on type clamp. :/
Put the meter leads farther on into the circuit, you choose where, just so long as you get 12 volts... say one pressed into each clamp this time... have someone try starting it again.
d) voltage dropped to zero
e) voltage stayed steady at ~12 volts
d = clamps aren't conducting the high current load needed to operate the starter only enough to operate the meter and maybe the lights. One or both of the clamps is causing your "open" circuit. To figure out which one, move one meter lead back to its spot on the battery's post and try starting it again. Clean them both anyway. :)
e = the "open" is still "ahead of you" somewhere "into" the circuit... keep going! :) You choose where to put the meter leads... say this time jump over to the large (5/16") positive (forward) terminal on the starter relay with the positive lead and the negative lead clipped to the negative battery clamp. You should have the ~12 volts. Have your helper try to start it. You know the drill if it drops to zero, the "open" is "behind" where you had the leads. In the positive battery cable in this case. Might as well try it again with the negative lead on the engine block to eliminate the negative battery cable and its connection to the block.
f) voltage stays steady at 12 volts
This time check the relay, you won't get 12 volts until the helper tries starting it again. Clip the positive lead to the large (5/16") rear-starter terminal of the relay and the negative lead still on the engine block and try starting it.
g) no voltage could mean a bad relay contact inside or the relay is not "picking up" due to electrical/mechanical problems or the ignition switch isn't sending "electricity" to the relay's operating coil.
h) 12 volts and no start. The open is still ahead of you either the starter cable, the starter terminal connection or inside the starter. Keep going. :) Clip the positive meter lead to the starter's terminal and the negative meter lead to the engine block.
i) 12 volts and no start. You're starter's "open" inside.
It takes longer to round up the help;) and dig out the meter and get started than the testing takes. For sure the testing is faster than it took me to type this out using my two index fingers. :)
I tried using a test light a couple times and couldn't make sense of it. :/
Sometimes the light seemed to light dimly etc. :/
I gave it away. :)
Is there something like this in a FAQ somewhere?
If so where?
If not, this needs polishing up and put in a FAQ. Somewhere. ;)
Alvin in AZ
Last edited by dialogueonlife1; Apr 27, 2007 at 04:05 PM.








