[DodgeCummins98]

Well my grid heater is not working now. When I turn the key on, the WTS light goes off as soon as the rest of them do.

I'm assuming this has to do with the new tranny because it never did this before. I guess I will need that computer reflash after all.

Does this sound like a software/ECM to you?

 

[nickg]

depending on the outside (ambiant) temp they wont come on anyway, not sure at which temp they start working again
....try again in the fall (LOL)

 

[saab9k]

don't ever use preheat, starts first turn down to 22F, coldest this winter

 

[DodgeCummins98]

Well I don't "need" the heater, but I want it.

With the heater the truck will fire as quick if not quicker than a gasser. Without it it wants to think for a short second.

Basically I just want to know why they might not be working, and if getting the ecm reflashed for a 5 spd would correct the problem.

 

[nickg]

Well I don't "need" the heater, but I want it.

With the heater the truck will fire as quick if not quicker than a gasser. Without it it wants to think for a short second.

Basically I just want to know why they might not be working, and if getting the ecm reflashed for a 5 spd would correct the problem.

you might want it but the ECM is not going to give it to you till it gets cold out, unless you wire it up to fire the grid manually or fool the IAT or ECT into thinking the engine is cold

 

[DodgeCummins98]

Oh yes I understand that. But they aren't coming on at all. Even in warmer weather the light has always stayed on for a few seconds. Now it goes off immediately.

 

[Russ Roth]

Mine didn't work when I really needed it several winters ago. I finally traced it to a bad connection at the crimp in the ground wire.

 

[Mopar1973Man]

Really simple...

When the WTS light is ON look at the battery voltage. If the volts are low the grid heater is on. If the voltage is high the grid heater is OFF.

Problemed areas include fusable links, realys, loose connections, etc.

As a matter of fact this thread reminded me to DIS-CONNECT my grid heaters. My morning temps are roughlt 40*F now and I don't need to waste fuel charging up batteries for a grid heater. (Heavy ampreage draw!)

I also can start without grid heaters down to about 25-30*F...

As a matter of fact as soon as you get to 15-20 MPH the grid heaters are cancelled...:w:

 

[nickg]

Really simple...

When the WTS light is ON look at the battery voltage. If the volts are low the grid heater is on. If the voltage is high the grid heater is OFF.

Problemed areas include fusable links, realys, loose connections, etc.

As a matter of fact this thread reminded me to DIS-CONNECT my grid heaters. My morning temps are roughlt 40*F now and I don't need to waste fuel charging up batteries for a grid heater. (Heavy ampreage draw!)

I also can start without grid heaters down to about 25-30*F...

As a matter of fact as soon as you get to 15-20 MPH the grid heaters are cancelled...:w:

FFIW when its cold out everytime (even with a hot engine) my grids would fire. My truck is used as a courior veh, so every start loads up the alt so bad I'm sure that it I'm gonna take out the alternator. I never did trouble shoot it to find out if I have a sensor out of range or if its normal, so I too just disconnect the grids, by unplugging the signal wire at the relays. it did cause a code to be tripped but no check engine light. seeing as my rig is kept in a gargage I never had any starting issues...
now that its warm out the grids dont fire anyway.
so I do the trouble shooting next year

 

[98.5HOTROD]

Grid heaters will not come on when outside air temp is above 59*, give or take a couple of *s.

 

[Mopar1973Man]

so I too just disconnect the grids, by unplugging the signal wire at the relays. it did cause a code to be tripped but no check engine light.

Pull the battey leads to the relays and the code wont happen... (D'Oh!) :lol3:

 

[awenthol]

Oh yes I understand that. But they aren't coming on at all. Even in warmer weather the light has always stayed on for a few seconds. Now it goes off immediately.

You're 100% sure it's not too warm? Have you double checked (like mopar1973man said) fuses and wires?