'm still having a problem with my electrical system
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Joined: Feb 2007
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'm still having a problem with my electrical system
Hi all. I posted a while ago about my 79 f250 with the 351M. I went out to start it one morning and when I turned the key, it just buzzed. I checked the battery and charged it. I replaced the starter and solenoid. I put the battery cables back on, turned the key and....the solenoid buzzed again, then I had no power. No lights, nothing. Am I not getting enough amps to the solenoid? Maybe a bad ground? I can see maybe a bad ground causing not enough amps to close the solenoid, but why would I have no power afterwards? I gave up for the night, but I expect that tomorrow I'll hook up the battery after charging it again (it was at 12.44vdc), pull the lightswitch on and have lights. Then I'll turn the key, get the buzz, then have no power again. There can't be that much to go bad here.... Thanks in advance...
Zach
Zach
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I'll take the battery Sunday morning and have it checked. I just replaced the cable from the battery to the solenoid, the battery to the engine block, and the solenoid to the starter a year ago, but maybe one of the connections is dirty. It'd almost have to be the negative cable at the block. The others look good. Also, if I use a switch and jump the solenoid from the positive lug to the small lug next to it, it should engage the starter, but it just buzzes, so that should rule out the solenoid to starter cable. This electrical stuff sucks, but at least it's easy to trace everything out.
Tuned
Joined: Jan 2009
Posts: 457
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From: Decatur, AL
Buzz from solenoid usually means bad battery. A surface charge on a battery, the static reading, really is as meaningless as "the ole green eye" electrolyte readers on batteries. You HAVE TO TEST IT. Doing batteries since 1978, i would tell you that a charged battery in good shape should have at minimum a 12.6V static charge. Most batteries today are 500CCA or better. Your truck is less than 300CCA from the factory. Assuming you havent built a high compression monster, a mediocre battery should spin it over very well. I keep a 700+CCA in my truck at all times. But that is just me.
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