wait to start light - Dodge Cummins Diesel Forum
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post #1 of 7 (permalink) Old 05-07-2012, 08:34 PM Thread Starter
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wait to start light

I have a bit of a problem that I need help with. My 98 12 valve truck's wait to start light is not lighting up even if I put the AIT sensor in a cup of ice cubes. The grid heaters work but the light will not turn on. I have tested the AIT sensor using the info in the Dodge service manual and it seems to work fine. The wait to start light also doesn't come on when the key is first turned like the brake, check engine, ect...
Now for the tricky part! While driving and making any boost the wait to start light will come on. The light stays lit until I stop to turn, stop sign,ect... then comes right back on.
I have just completed a 5 speed conversion on the truck and I also did away with the fuel shut off solenoid. I am hoping the wiring involved in this wouldn't cause my problem. My concern is that the PCM isn't receiving some signal that it should be.
I do not think the grid heaters are turning on with the light while driving. They would have melted by now
Thanks for your time and any help would be greatly appreciated, MBanning

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post #2 of 7 (permalink) Old 05-08-2012, 10:23 AM
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Burned out light bulb?

Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
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post #3 of 7 (permalink) Old 05-08-2012, 11:18 AM
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"Now for the tricky part! While driving and making any boost the wait to start light will come on. The light stays lit until I stop to turn, stop sign,ect... then comes right back on."

Doing a 5 speed conversion you had to move some stuff by the dash. You might have broken or disconnected a wire to that light.

1997 3500 club cab 3.54 gears towing & camper pkg. Still stock with a built transmission at 120k. 4" exhaust, 4kgsk, and exhaust brake waiting for installation. 37337 upgrade. Still need ideas for improvements for hauling 15k fifth wheel.
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post #4 of 7 (permalink) Old 05-08-2012, 12:08 PM Thread Starter
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Don't think that is it super moderator. Country, I don't think a broken wire could be it. The light only comes on while driving, there should not be any power to the light wires at all during these conditions. A bad or broken wire would make sense if I was having problems as start up but what about when driving? Thanks guys and bump, MBanning
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post #5 of 7 (permalink) Old 05-08-2012, 12:12 PM
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Almost sounds like it is getting reverse polarity somehow.

I'd start checking grounds. Familiar refrain on the Dodge chassis, but that is because that is almost always the culprit.

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post #6 of 7 (permalink) Old 05-08-2012, 07:36 PM Thread Starter
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Quote:
Originally Posted by glfredrick View Post
Almost sounds like it is getting reverse polarity somehow.

I'd start checking grounds. Familiar refrain on the Dodge chassis, but that is because that is almost always the culprit.
This is going to be a pain! Also want to add the symptoms are the same with the air intake temp sensor unpluged. Thanks, MBanning
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post #7 of 7 (permalink) Old 05-09-2012, 07:36 PM Thread Starter
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Thumbs up

Been at it for a couple hours but I got it! When I got rid of the auto I removed all of the associated wiring all the way back to the PCM. When I removed the no longer needed wires from the connector I managed to bend pin 20 over in to the wrong spot. Pin 20 controls, you guessed it, the wait to start light. I straightened out my mess and took it for a spin. Problem solved. Thanks again, MBanning
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