Truck Eating Alternators - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 12-21-2010, 01:05 AM Thread Starter
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Truck Eating Alternators

My truck seems to have an appetite for alternators as of late. I have replaced 2 of them in the past 3 months, and the dreaded squeak is coming back. It's a warrantied part, so the cost is not killing me, and although I'm getting good at changing 'em quick, this is ridiculous. Any idea what could be causing this? My original problem started when my converter started random lock-unlock, so I took the truck to the tranny shop that built my trans. I was told the APPS signal was spiking, so I adjusted that properly, and the problem persisted. Knowing the RF interference was most likely an issue, I replaced the alternator, and all was well. For about three weeks. The trans problem is completly cured, but the truck is still consuming alternators. This one has been on there now for about 9 weeks, and is starting to squeak also. What am I missing? Belt and tensioner are also new parts.

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post #2 of 5 (permalink) Old 12-21-2010, 01:33 AM
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how are your batterys?

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post #3 of 5 (permalink) Old 12-21-2010, 04:40 PM
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You may want to check the battery ground on the side of the block, sometime they will give you some trouble.
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post #4 of 5 (permalink) Old 12-21-2010, 08:29 PM
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I agree you want to check the battery voltage, before you start it after it has been sitting for a while. If the alternator has to continually put out full output for long periods it will not last a long time.
If you put on an unregulated battery charger, that will weaken the diodes. Cleaning the battery connections and cables is always a cheap and important thing to do any time you have any electrical issue.

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post #5 of 5 (permalink) Old 12-22-2010, 01:52 AM Thread Starter
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Battery connections and cables are clean with good connection. I have not had the batteries independently tested. I will do so ASAP. I will also check and clean the block-ground location. Thanks for the replies, I'll post back what I discover.

My truck wants to be a semi when it grows up...
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