77 F150 auto 6 cylinder starting problems

Asked by Jun 10, 2013 at 11:37 AM

Question type: Maintenance & Repair

I tried the positive cables connected to the pos of batt to the solenoid
when i connected the neg cable my alternator started running?  why is that .

6 Answers

100,505

It probably means that you have bad diodes in you alternator.

whats a diodes?

100,505

They are an electronic device that only allows voltage to go only one way so a voltage feedback won't happen. I your case it sounds like a complete failure.

Does anyone has another suggestion ... Any other solutions ? Does that mean I have to get a new alternator?

100,505

Yep, and you better replace the regulator also. Fortunately the older Ford alternators are very reasonably priced at your local parts store. I am guessing that you have either a 30 or 40 amp alternator as you only have the 300 cid 6 cylinder engine.

I also tried the positive cables to 2 sides of the solenoid and finally thr truck started.. someone mention if this is the case then I should have a ignition or safety switch issue...?

Your Answer

Shortcuts

Maintenance & Repair Experts

  • #1
    Tom Demyan
    Reputation
    179,910
  • #2
    dandyoun
    Reputation
    95,370
  • #3
    tennisshoes
    Reputation
    78,620
View All

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.