Start solenoid wire problem
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Start solenoid wire problem
Hello everyone I am new to this site so bare with me if I post in the wrong spot. I have a 1976 Ford F-250 base with a 390 bolted to a 4 speed np 435. It’s current issue that I can not figure out is the red-blue wire attached to the start solenoid is having constant power keeping the starter cranking. The ignition switch is good and supply’s power as it should. once you release the key from start and it goes back to just run the power coming from it stops, so I don’t think it’s that. Now the ford wiring diagram says the wire goes from the ignition to a neutral safety switch (which I don’t think the manual trucks have) then goes to the ignition box and start solenoid, correct? So how could I be getting power at the start solenoid?
new start solenoid
new ignition box
new key switch
since I started having the problem
new start solenoid
new ignition box
new key switch
since I started having the problem
Lead Driver
Joined: Oct 2018
Posts: 7,847
Likes: 2,353
If you're sure the switch and the solenoid are good then it almost has to be a wiring problem between the two.
What doesn't make sense is if the wire that excites the solenoid is hot all the time then the wire from the switch should always be hot as well. is it ? if it's not then you might have the wrong wire on one end or the other .
I didn't think it traveled through the ECM but if it does a messed up plug in or wires melted together there could put juice out one side and not the other. there isn't a safety switch so there aren't many places to break the current from feeding both directions.
What doesn't make sense is if the wire that excites the solenoid is hot all the time then the wire from the switch should always be hot as well. is it ? if it's not then you might have the wrong wire on one end or the other .
I didn't think it traveled through the ECM but if it does a messed up plug in or wires melted together there could put juice out one side and not the other. there isn't a safety switch so there aren't many places to break the current from feeding both directions.
Lead Driver
Joined: Jul 2017
Posts: 9,580
Likes: 1,162
From: San Jose, CA
Hey Kurtis, welcome! So did this problem just crop up at some point recently? Or was there some other work done just prior to this happening?
Or yet another possibility, did you just get this truck yourself? If so the previous owner could have done any number of things that have to be tracked down.
You said constant power, but is that all the time, or just with the key in the ON position? If all the time even when the key is in the OFF position, then you are simply going to have to trace the Red w/blue wire until you find where it's getting it's power from. Are you triple-sure that the ignition switch is not at fault? Does the end of the wire at the switch have power all the time too? If you disconnect the wires from the switch, what happens to the power at the relay/solenoid?
Good luck.
paul
Or yet another possibility, did you just get this truck yourself? If so the previous owner could have done any number of things that have to be tracked down.
You said constant power, but is that all the time, or just with the key in the ON position? If all the time even when the key is in the OFF position, then you are simply going to have to trace the Red w/blue wire until you find where it's getting it's power from. Are you triple-sure that the ignition switch is not at fault? Does the end of the wire at the switch have power all the time too? If you disconnect the wires from the switch, what happens to the power at the relay/solenoid?
Good luck.
paul
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Green_Bean
1973 - 1979 F-100 & Larger F-Series Trucks
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Dec 16, 2020 04:44 PM
