7.3 Alternator issues - Ford Powerstroke Diesel Forum
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Old 10-21-2012, 09:10 AM
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7.3 Alternator issues

My 2002 Excursion is going through alternators about every four months. Anyone else having this issue and is there a solution?

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Old 10-21-2012, 09:21 AM
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My dad has a 97 f350 7.3 and we have put 3 alternators on it in the last two years. I cant figure out what the deal is.
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Old 10-21-2012, 09:52 AM
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What kind of alternators are you putting on it? Are they new or rebuilt? Where are you buying them from?

How old are the batteries? Have they been tested recently?
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Old 02-06-2013, 05:07 PM
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I know this is a late response but it may help someone.

Had this issue on a company truck years ago. After many alternators and a wiring harness we discovered the glow plug relay was sticking. After correcting the issue and driving a few more miles a glow plug came apart and went through a cylinder. I recommend replacing the relay and plugs. That is what fixed that one. Well a long block fixed the plug issue so i recommend doing them before they come apart if this in fact your issue.

Last edited by F350none; 02-06-2013 at 05:15 PM.
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Old 02-07-2013, 12:21 PM
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The alternator harness goes bad and it will eat alternators. There is a replacement harness available. Seen 2 trucks with this problem, new harness fixed both.
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