Replacing the solenoid
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Freshman User
Joined: Feb 2013
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Replacing the solenoid
Hey everybody,
Last couple days my '77 F150 has been having trouble starting. Figured out the solenoid was blown, so I ordered a new one from LMC trucks..
Just putting it in today. I replaced the old solenoid with the new one, put all the wiring back in place. Now when I put the battery cable back on the terminal, the truck tries to start! I can't see what I did wrong here; I put everything the way it was with the old solenoid. Is it possible I got the wrong one?
Thanks in advance
Last couple days my '77 F150 has been having trouble starting. Figured out the solenoid was blown, so I ordered a new one from LMC trucks..
Just putting it in today. I replaced the old solenoid with the new one, put all the wiring back in place. Now when I put the battery cable back on the terminal, the truck tries to start! I can't see what I did wrong here; I put everything the way it was with the old solenoid. Is it possible I got the wrong one?
Thanks in advance
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
It is very possible the new solenoid is bad. If you have a meter, check for continuity between the two large terminals. Should be none till voltage is applied to "S" term. Only thing I can think of that would make it do it even with "S' and "I" wires disconnected.( Providing you didn't place battery cable and starter cable to the same term)
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Are the 'S' and 'I' wires already in place when do you do this? What is the position of the key?
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Freshman User
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The truck wouldn't start one day. The solenoid would just click. I short circuited the battery to the starter and the starter worked fine, engine started up fine.
Today I replaced the solenoid. First I removed the positive cable from the battery. Then I removed all the wires from the solenoid terminals. Then I removed the solenoid and replaced it with the new one. I replaced all the wires, starting with the starter cable, to the ignition wires, back to the positive wire. Last thing I did was put the positive cable back on the battery. Next time, I'll have to remove the negative first.
The ignition was OFF the entire time; keys were not in the ignition.
First time I tried, the S and I wires were connected. As soon as I made contact with the battery, it tried to start.
Second time, I removed both S and I wires. Same behavior.
Today I replaced the solenoid. First I removed the positive cable from the battery. Then I removed all the wires from the solenoid terminals. Then I removed the solenoid and replaced it with the new one. I replaced all the wires, starting with the starter cable, to the ignition wires, back to the positive wire. Last thing I did was put the positive cable back on the battery. Next time, I'll have to remove the negative first.
The ignition was OFF the entire time; keys were not in the ignition.
First time I tried, the S and I wires were connected. As soon as I made contact with the battery, it tried to start.
Second time, I removed both S and I wires. Same behavior.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Sounds like a bad solenoid then. There should be no continuity between the two large studs without the solenoid grounded and power applied to the 'S' terminal. I recommend picking up a premium-brand solenoid from your favorite parts house; the $20 ones fail early and often (LMC is most likely a marked up value brand, especially if it came in a white box).
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