Unknown Electrical Issue HELP - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 10-27-2012, 01:34 PM Thread Starter
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Exclamation Unknown Electrical Issue HELP

Yesterday I noticed a faint buzzing that would come and go so I took a look at the relays. The cab lights were also lit but very dim with the doors shut and no keys in the ignition. Also I could turn the blower motor on but not to the max or a/c setting. The number 1 relay was the source of the buzzing but I cannot figure out why so I removed it. This morning I woke up to a dead truck which I had a feeling was coming. When I tried to start the truck I had a new buzz. It sounded like it was coming from behind the cubbyhole and it would start when I turned the key but did not crank. After a jump I replaced the #1 relay and did not hear the buzz from the center of the dash after several attempts to make it happen. After shutting the truck down and sitting in it with the keys out and the doors shut I noticed the buzz from relay 1 returned. When the door is opened the buzz disappears.
Any ideas?
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post #2 of 11 Old 10-27-2012, 02:13 PM
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Low voltage. Fix the voltage issue, I bet the buzzing stops.

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post #3 of 11 Old 10-27-2012, 06:45 PM Thread Starter
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Pulled batteries and had them checked 12.4v and 13v
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post #4 of 11 Old 10-28-2012, 05:40 AM
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Quote:
Originally Posted by jones2012 View Post
Pulled batteries and had them checked 12.4v and 13v
THAT is not a battery check, static voltage is meaningless. Charge them up and have them Load Tested at a High Rate (Not the puny hand held 100A testers the Auto Parts Stores use on the 4cys)

Also, what year is your truck? There has been a major electrical revision in '01...
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post #5 of 11 Old 10-28-2012, 09:53 AM Thread Starter
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Its a 2000. Can I get that done at any shop?
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post #6 of 11 Old 10-28-2012, 09:54 AM Thread Starter
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Batteries are dead again this morning. I guess Ill have it jumped again and take it to a shop. Anyone know of a decent place around College Station, Tx
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post #7 of 11 Old 10-28-2012, 11:16 AM
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Load test the batteries individually too, not in parallel.

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post #8 of 11 Old 10-28-2012, 03:00 PM
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Initally, it sounds like a bad ground causing backfeed through a power circuit. If it is doing it through a constant power circuit, it might drain your batteries. The second "buzz" is probably from the dead batteries.
Get the batteries properly checked, then look and see what is powered from that #1 relay. Once you know what is on that relay, I would check the grounds for those circuits.

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post #9 of 11 Old 10-29-2012, 09:44 AM
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It sounds like you may have a short to ground some wheres.

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post #10 of 11 Old 10-29-2012, 02:15 PM Thread Starter
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Bad GEM. Thanks guys
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