Volt gauge jumping - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 12 (permalink) Old 02-03-2009, 01:26 AM Thread Starter
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Volt gauge jumping

after startup on my 91.5 the volt gauge starts to jump..while driving or increasing rpm it seems ok..just at an idle..i replaced the voltage regulator on the firewall and took the truck to and auto parts store to have the altornator tested and they said it was ok.. i've been checking,cleaning,and greasing connections everywhere and still no luck...any help would be great..thanks
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post #2 of 12 (permalink) Old 02-03-2009, 04:24 AM
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Its your grid heater cycling. It is norml for about 5 minutes of driving for that to happen.

When you first turn on the key the wait to start light comes on. After the engine is running. The PCM does it with no lights or warnings.

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 12 (permalink) Old 02-03-2009, 02:40 PM Thread Starter
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i know what you mean about the cycling and thats not the cause because it does it all the time..its almost like the gauge jumps with the engine rpm..once you increase the rpm it stops..when you start it up the gauge comes up slow until it reaches where it is fully charged..then starts bouncing.....i wish i could describe it better....
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post #4 of 12 (permalink) Old 02-03-2009, 03:32 PM
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A firewall regulator??? That year model should be built into the PCM. Going to the old style on the fire wall is a common swap when the PCM has problems.

Is that regulator a Mopar model. The after market regulators don't have a good track record. I stoped using them decades ago for poor alt controll issues.

Hit a junkyard with some old Dodges and grab an orginal one and try it.

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 12 (permalink) Old 02-03-2009, 03:57 PM Thread Starter
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i'll see if my brother will let me use his off his 93...if not i'll hunt the junkyard this weekend..do you know if a mopar one is still available? thanks danny
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post #6 of 12 (permalink) Old 02-04-2009, 04:54 AM
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Dodge still has the old style. Now they are in the restoration/performance book.

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 #7 of 12 (permalink) Old 02-05-2009, 12:07 PM Thread Starter
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wjen i bought this truck about two years ago it was charging fine..last month the computer went bad so i had it sent out to be reconditioned..your saying that my 91.5 suould not have a firewall mounted regulator and that doing that was a quick easy fix in the past..now that my computer was fixed can it be possible that the alternator it getting a mixed signal between the two? If this is the case and i wanted to eliminate the firewall mount how woul i do that..just unplug or more involved? Thanks for all the help...Danny
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post #8 of 12 (permalink) Old 02-05-2009, 03:20 PM
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I am under the impression that the 91.5's had the alt controlled by the PCM. I don't have one close by to open the hood to be sure.

Take a couple of pic's and post them of the regulator and the alt. Try to get as much of the wiring in the pic that you can. If it is a add on I dought if the wiring will look close to factory.

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 #9 of 12 (permalink) Old 02-06-2009, 04:40 PM Thread Starter
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you were right about the track record on the aftermarket regulator...went to the junk yard today and found one off a gas engine truck plugged it in and it seems to be ok..i'm holding about 14.5 volts..does that sound ok?thanks for your help...Danny
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post #10 of 12 (permalink) Old 02-07-2009, 04:38 AM
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That voltage sounds fine.

When it comes to Dodge old style regulators I stoped buying after market a couple of decades ago.

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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