Random GEM-related errors - everything works fine
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Fleet Mechanic
Joined: Aug 2010
Posts: 1,464
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From: Sedalia, CO
Mark
Got Data?
Joined: Dec 2012
Posts: 4,274
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From: Lake Stevens, WA
Mark there may be some wires, chafing or grounding somewhere that are causing these fuses to blow. It’s often not the modules that are at fault but the wiring to them. Recommend checking those circuits that blew with a multimeter for short to ground while wiggling them.
Veteran/Sheepdog
Joined: Feb 2012
Posts: 6,047
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From: Western AR
Fuses blow because too much current tried to flow through it (most everyone reading this knows that). That is normally a short, but could be component induced in rare cases where a circuit board kicks the bucket. Short can be hard (always there until discovered) or soft (intermittent or caused by trouble shooting activities). Sounds like yours is soft.
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Fleet Mechanic
Joined: Aug 2010
Posts: 1,464
Likes: 159
From: Sedalia, CO
Fuses blow because too much current tried to flow through it (most everyone reading this knows that). That is normally a short, but could be component induced in rare cases where a circuit board kicks the bucket. Short can be hard (always there until discovered) or soft (intermittent or caused by trouble shooting activities). Sounds like yours is soft.
Thanks guys!!!
Mark
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Fleet Mechanic
Joined: Aug 2010
Posts: 1,464
Likes: 159
From: Sedalia, CO
After towing through the Rockies last week, including some in the rain, a thorough wash, numerous key cycles, and driving it again today, I think the issue all along was a shorted wire going to my airbags. I had it connected to the hot side of fuse #11, which is on the wiper motor circuit. When the wire shorted (it had gotten caught on top of the parking brake stopper pad, and so was crushed against the bare metal above that, perhaps for years), it was on the wrong side of fuse #11 to blow it, so it ended up blowing first one 50a fuse to the ignition switch, then the other. I've not had a single extraneous code since fixing the short, so I'm wondering if I've been sending occasional quick voltage spikes through the switch as the insulation wore away, triggering the codes-without-failure I've seen for the last year, or more.
My final troubleshooting step is to post that the problem is resolved, figuring that'll trigger a problem for sure if it isn't.
Thanks to all who helped, and a special thanks to @BWST . You are the man, sir.
Mark
My final troubleshooting step is to post that the problem is resolved, figuring that'll trigger a problem for sure if it isn't.
Thanks to all who helped, and a special thanks to @BWST . You are the man, sir.
Mark
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