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  1. #1

    Default PMC 351 (Ford) circa 1990 - Electrical issue

    I have a 1990 PCM Ford 351 in a Supra Conbrio.


    I tried to use a mini portable jump starter to start it, and it shorted "something" out. Now, any time power is connected (i.e. battery hooked up) the starter engages, even if key is not in the ignition.


    Which part(s) did I possibly short out?

  2. #2

    Default Re: PMC 351 (Ford) circa 1990 - Electrical issue

    Answer: starter solenoid

  3. #3
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,764

    Default Re: PMC 351 (Ford) circa 1990 - Electrical issue

    shouldn't have...more likely the main fuse at that solenoid...

  4. #4

    Default Re: PMC 351 (Ford) circa 1990 - Electrical issue

    You would think... but the breaker was not even tripped. The solenoid was shorted out.

  5. #5

    Default Re: PMC 351 (Ford) circa 1990 - Electrical issue

    I would test/check the 50 Amp circuit breaker.

    My 50 Amp circuit breaker on rear of engine where starter relay is also located failed over time, could not figure out until it failed. Replaced a batter I did not need to, check cleaned all connections at all locations. R & R Mando alternator twice to have tested (its good) (Dash VM was barely 12Volts, add acc. it dropped.

    Circuit breaker never tripped off, but was preventing full voltage from being passed through to rest of system. No volts no start. Ohms meter confirmed there was not continuity. Dealer wants $108, I bought on amazon.com for $38 prime, ebay was $35 free shipping.

    I used a $5 50 amp auto parts store circuit breaker as a fix until the Blue Sea Systems part #2142 shows up from amazon.

    Dash Volt meter went right back to showing 13-14 volts after replacing the circuit breaker.

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