starter solenoid problem with my 1989 Mustang LX 5.0 - Ford Mustang Forum

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post #1 of 3 (permalink) Old 03-20-2010 Thread Starter
pt2300's Avatar
Joined: Feb 2008
Location: Phoenix
Posts: 10
starter solenoid problem with my 1989 Mustang LX 5.0

If anyone knows how to fix this problem please let me know! I have gone through about 4 starters now because of this. I'm having a problem with the starter solenoid causing the starter to continue to run after I start my car. I can get it to stop by opening the hood and hitting the solenoid w/ a hard object. I have changed the solenoid about 3 times to try and find if thats the problem. But it still is happening and I'm continuing to blow starters because of it. If you know what I have to change to get this to stop please let me know. Thanks.

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post #2 of 3 (permalink) Old 03-20-2010
JPIZZLE52's Avatar
Joined: May 2006
Location: Shreveport
Posts: 212
Had the same problem with a 5.0 grand marquis a couple months ago at shop.. We were putting borg warner solenoids on it. Put a motorcraft solenoid on it and problem solved. Give that a shot. Also double check the small wire on the solenoid and make sure its not still getting power with the key in the RUN position. If it is you'll need to replace the ignition switch. G/L

1991 mustang GT, stock 5.0, off-road H-pipe, American Thunder Cat-Back with super 44 mufflers, 130 amp 3g alternator, Proform 2800 cfm electric fan, smog pump delete, MGW shifter with rally stripe knob, alpine cda-9886 with MTX 10" sub and alpine components all around... New 347 stroker in the works!

ASE certified mechanic: suspension and alignment, brakes, heating and air conditioning, and engine diagnostics
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post #3 of 3 (permalink) Old 03-20-2010
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Shane Dunlap's Avatar
Joined: Mar 2010
Location: Cary
Posts: 2
Hey PT,

I have the same problem on my 90 LX. I have changed the solenoid but it (the problem) has resurfaced after about two months. I was told to get a new solenoid from Ford (about $40.00) but haven't tried this yet. Also, get someone to check the voltage to the solenoid with key turned on and starting then off. Supposedly the voltage will be 12 volts cranking and 0 volts when turned back to off. Did you get any answers yet to your issue? Supposedly their are some solenoids that do not work well but have seen you have tried more than twice to replace them. I think I am going to try the one from Ford dealership next. Let me know if you have found the problem as mine comes and goes but tapping the solenoid with a wrench seems to disengage starter. Some others have said to check wiring for lose connections and make sure the solenoid is grounded well on the firewall. Good luck as this is a nagging problem.
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