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1977 Ford F-250 Electrical trouble

Tiny
FARMERBUD
  • MEMBER
  • 1977 FORD F-250
  • V8
  • 4WD
  • MANUAL
  • 70,000 MILES
My trusty ol' farm truck wouldn't start last Wednesday. I'd turn on the key and nothing happened. I wasn't too concerned as this has become a frequent occurrence in wet weather. I tried again the next day and it took right off. I drove it 1/2 mile and when I turned off the key the motor kept running. I pulled the 2 wire connector to the electronic ignition module to get the engine to stop. Thinking that the module was my problem, I took it to Advance Auto to get a replacement. They tested it and said it checked OK. On their advice, I bought a replacement switch. Installed it today and found the battery was dead when I tried to start. Charged the battery and when I reconnected the cables, the voltage regulator started buzzing. I pulled the cable off the battery and looked for a grounded wire. Didn't find any. Any suggestion as to my next move?
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Saturday, December 13th, 2014 AT 8:01 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
You say that you replaced a switch. Was this a new ignition switch?
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Saturday, December 13th, 2014 AT 8:35 PM
Tiny
FORD76460
  • MEMBER
  • 14 POSTS
I had the same issue. I would turn on the headlights (so I knew there was power) as soon as I turned the key, nothing. Everything was dead. I'd tap on the starter relay and the lights would come back on. I traced the problem to the positive terminal cable and replaced that. It started right up after that. It could be just as simple as that.
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Tuesday, March 3rd, 2015 AT 7:33 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Thank you for the input, as we have not heard from the member since he posted, I would hope that the problem as been solved, it is always good to get feed back form members who have had the same problem and found answers.
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Tuesday, March 3rd, 2015 AT 2:34 PM

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