1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Elec. problems...

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Old Nov 12, 2011 | 07:54 PM
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Default Elec. problems...

One day leaving for work in the morning I didn't have any "running" lights. Head lights and turn signals work, but no dash, or parking lights. All fuses under steering column are good. Any ideas as to what prob is? Anyone else have same issue?
 
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Old Nov 12, 2011 | 10:25 PM
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Headlight switch. A lot of times the dimmer part of the switch burns out. you can test it to see if it has power coming out of it to the dash lights. check and see if you have power on fuse #14 (3 amp fuse).
 
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Old Nov 13, 2011 | 04:08 PM
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great. thanks. I suspected that but day light was running out and rain was coming down hard so didnt check.

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No dash lights, no pwr to fuse. That thing is hard to get into. basically pull dash out to get to switch. Good job engineers!
 

Last edited by Dozey; Nov 13, 2011 at 04:08 PM. Reason: Automerged Doublepost
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Old Nov 14, 2011 | 07:29 PM
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hmm. nope. just replaced dimmer switch. kind of a pain. and still no lights
 
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Old Nov 15, 2011 | 07:56 AM
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start checking grounds. check the ground on that connects to the core support from the battery. sounds pretty similar to what my truck was doing and thats where my problem was. Good Luck
 
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Old Nov 15, 2011 | 08:18 AM
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dimmer switch = turn signal stalk

headlight switch = **** lower left dash
 
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Old Nov 15, 2011 | 01:50 PM
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you replace the dimmer switch (multifunction switch)or headlight switch?
 

Last edited by jwirth; Nov 15, 2011 at 02:03 PM.
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Old Nov 15, 2011 | 02:15 PM
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I would call it a dimmer switch but its function is running light, head lights, and instrument panel dimmer. But when looking at napa and autozone they ask about intermit. wipers or not. It is the head light switch on lower left dash that has instrument dimmer attached. I suspect a grounding issue because I got the running lights to work a few times for a moment. Is that what the spade term. on back of that housing is for is a ground wire?
 
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Old Nov 15, 2011 | 03:17 PM
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The HL on/off switch (which also "dims" the dash lights) is a push/pull **** that rotates to dim the dash lights. They are notorious for failure due to carrying full headlight current load, like all the other inadequately designed Mopar HL circuits of the era. If that is the problem, I'd recommend replacing it and running the headlights off relays to preserve the switch/**** which is becoming expensive and difficult to find.
 
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Old Nov 15, 2011 | 04:59 PM
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Yea, cant find any prob. But also the ground to it must be in that giant plug on top. I can get the running lights to come on when I pull the **** out about mid way from off to the first click (running lights).
 
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