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Father in laws 96 cummins wait to start light comes on for heat up but then starts to flash and never goes off. Wiring shows it coming from the PCM. Any ideas. Thanks, Romie
 

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Here's a very detailed heater troubleshooting guide Ram Diesel Manifold Heater Problems
If the light is flashing but the grids aren't coming on you have a very unusual problem.
Does the voltmeter dip and climb in time with the light?
 

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my truck does exactly the same thing--my colt guage doesn;t spike too much (like normal i guess)--this weekend i tested the relays and they are working fine going to the grid heater, so i don;t know--tomorrow i will go through the heating problems guidline that you posted and see what i come up with--if you figure yours out, please let us know what's up--thanks aj
 

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Romie--try changing your fuel filter--my truck did the same thing, and after i changed it it doesn't flash anymore and turns off after the heaters shut off like normal:party018:--aj
 
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