'96 Dodge Ram voltage problems

[mjonesjr]

I have a '96 Ram that when the truck is idling in drive, the voltage drops to below 12v. It has not done this until it got cold this winter.

I have had the alternator tested and replaced the battery. The alternator tested good.

Anyone have any ideas?

 

[Earl43P]

I'd look at what the actual idle speed is.

Sounds like it could be low.

 

[mjonesjr]

Now that you say that, I bet it is. I think it only started doing that after I started using the SCT. I may have to have the program changed a bit.

 

[Hahnsb2]

Yeah, maybe flash the stock tune back and see what happens, if the SCT is the problem, have the idle raised a bit (assuming you have someone doing e-mail tunes for you).