engine light - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 12-10-2010, 07:36 PM Thread Starter
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engine light

Hello everyone

I went out to my truck last night its a 93 the engine light was flashing codes. they were 12 and 41. Alt gauge is not moving , and alt is not charging is there an external regulator or is my alt toast. Any help will be much appreciated
thanks.
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post #2 of 7 (permalink) Old 12-11-2010, 05:37 AM
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The Alt regulator is built into the PCM.

That code 12 is not listed in the 93 service manual.

code 41 Generator field not switching properly.

Does the CC and A/C and OD (if an auto trans) work????

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #3 of 7 (permalink) Old 12-11-2010, 04:33 PM Thread Starter
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Truck is a 5 speed , cc is working, tach is working,air is working. went for a drive wasn't charging came home, it started charging idling in the drive way and engine light went out.
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post #4 of 7 (permalink) Old 12-15-2010, 05:33 AM
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Over on the passenger side wheel well is a harness plug for the alt. Check the terminals in it for corresion or loose.

Also check the main alt charge wire. It has a connection close to that harness plug.

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #5 of 7 (permalink) Old 12-18-2010, 05:22 PM Thread Starter
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Thanks for the tips

Tried the truck this morning not charging cleaned connections nothing .
Smacked the alt bracket with big rubber mallet and it started charging,
Took it for a drive so far so good.
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post #6 of 7 (permalink) Old 12-19-2010, 04:23 AM
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Sounds like it is time for new brushes in the alternator.

93 Dodge /CTD, IC, 518, club cab LE, BHAF, KDP fixed, kelderman air ride
81 Isuzu /C223na, 5spd
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post #7 of 7 (permalink) Old 12-23-2010, 04:13 PM
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It may be yor crank sensor goin out some how cs and alt are tied together thre is a way to bye pass sensor and use an older external reg for your alt I,ve had the very same problem when I had my 92 with 93 cummins

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