99 Dodge Cummins Preheat Not Working

Having cold start issues? common problem to have the grid heating elements stop working causing a hard start condition.
This video takes you through the steps to beak the circuit down to determine where your system is failing.
The main harness coming off from the battery to the relays has fusible links built into it and can cause the entire system to stop working but physically look fine (Mopar part# 56019405).
That harness is discontinued so you can find some on Ebay and there are a few companies that make them, however, for less than $20 you can repair this harness yourself and get your grid heaters working again.
Easy cheap fix, just requires your time and some basic tools.
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#99 dodge cummins
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[@axisinferno3469]

The only video that actually showed the wiring locations and gave an explanation, excellent video.

[@FlippinCustomized]

Thanks for watching 🤙

[@rickgill-bh2cr]

Thak you for a very informative video very well done!

[@FlippinCustomized]

Thank you 🙏

[@bryanhauschild4376]

Best description I’ve seen on RUclips! Thx
Mine is working properly. Cycles three time to feel warmth. But it will not start when cooler outside. If I plug in block heater it will start. Next step is to test each injector by blocking one off at a time.

[@FlippinCustomized]

it may be working, but may also be partially burned out, I would take an amp reading on it when its on and compare to a known good one

[@bryanhauschild4376]

@@FlippinCustomized how would it flow current if it’s partially burnt out?

[@expressyourselfist]

BRILLIANT! you helped me solve the same problem, thank you.

[@FlippinCustomized]

Great glad it helped

[@JC-gw3yo]

I like your idea of moving the fusible link over to the power distribution box... Dodge should have done that...

[@FlippinCustomized]

Thanks man

[@TheRitchieLeeShow]

I’ve seen this cable assembly about 40ish, after market. Amazon has the fusible link available. I’m a diy’r.
I have a 95 12valve I thinking I have issues with my grid heater. At 32 degrees it is a bear to start. Thanks

[@FlippinCustomized]

I bet that’s it, verify with volt meter

[@littlejefe494]

What if the wait to start light never turns on

[@FlippinCustomized]

You have a separate issue possibly with the control circuit that turns the relays on

[@littlejefe494]

@@FlippinCustomized would connecting the battery backwards damage the ECU ? I ask because, some mistakes were made lol.

[@littlejefe494]

It use to run perfectly before

[@peterlamont898]

Great job.

[@FlippinCustomized]

Thanks 🙏