Hey you guys are great, have another question for you. When I start up my truck, or just idling at a stop light or just sitting there, the voltage meter goes down a little and then back up to normal. Just wondering if this could be my alternator? I could use some help here.

Have a 97 auto, #100 plate, 4" exhaust, and k&n intake, have egt gauge, and working on getting the kdp tabbed, and boost gauge.

Thanks

 

My guess is your grid heaters cycling...

but after driving a while, they should shut off...

 

100 percent in agreement here

Rick

 

I guess I make three that agree.

Hey, I rymed!!!

 

So if it does not shut off after awhile then what is the fix for that? And will it cause damage to the batteries or alternator?

 

Could this be voltage regulator? I heard that this could be the problem. Any info on this?

 

You better hope not.....the VR is an integral part of the PCM.

The grid heaters cycle on and off when the intake air temp drops below a certain temp....the cooler the climate you live in, the more frequently you will experience this.

Shovelhead posted a sticky that explains the grid heater cycling well.

https://www.dieseltruckresource.com/...d.php?t=120532

 

What year did they start using grid heaters? They weren't on the 12vers were they? The sig says '97 model. They didn't have 24 valves back then, did they? I think I'm having a brain fart. I'm blank. It has been a long day.

 

Grid heaters have been there since the B series CTD was first dropped into a Dodge.

 

Thanks, I learn something everyday. I thought that was just a 24 valve thing. I'm still a pup here at DTR! I think that question just slipped me back a bit!

 

Thanks for the info, however i read shovelheads post and mine happens at about 65-70 mph, he said that it should stop around 25. I had my alternator tested today and they say that it is not working right, so I should replace it. So I guess I will start there. Thanks for all the Help