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Fuse #33

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Old Jun 8, 2019 | 10:11 PM
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Fuse #33

Headed down the interstate yesterday and truck shut down on me. Had it towed to dealership and they worked on right away and discovered fuse 33 had blown, which is PCM, ECM, TCM. Headed home today and it blew again. Truck is stock, and only mod is a Ravelco plug, which has been installed since we bought the truck 2 years ago. Any ideas what would be causing it to blow?
 
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Old Jun 8, 2019 | 11:08 PM
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If you put a volt meter on the battery while the engine is running, how many volts does it read?
 
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Old Jun 9, 2019 | 08:13 AM
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Originally Posted by HRTKD
If you put a volt meter on the battery while the engine is running, how many volts does it read?
14.7 on one battery and 14.72 on the other
 
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Old Jun 9, 2019 | 03:04 PM
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Originally Posted by gjamerson
14.7 on one battery and 14.72 on the other
That sounds within spec. If it was an absurdly high number then maybe the alternator was bad and putting out too much juice, frying the fuse.
 
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Old Jun 10, 2019 | 02:39 AM
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This sounds like a wire is chaffed and grounding out somewhere.
 
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Old Oct 18, 2025 | 06:47 PM
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My 2012 was shorting out shift solenoids and blowing fuse 33. Not sure if the newer body trucks have the same problem
 
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