Voltage cycling at startup

[Andres]

I have an '03 Ram CTD ISB-305 that takes about 2-3 minutes for its voltage to come to 14+ on the dash. It hangs below that and I hear a relay clicking during that period, and I wonder if it's cycling the heater grid or something.



Anyway, on my '06 Ram the voltage comes up faster, perhaps 20 seconds.



Truck starts fine, batteries are a year old. Don't know if it's an alternator on the way out. Truck starts and runs fine, just curious if that is normal behavior?



TIA

 

[AWise]

There was a thread on this very thing a few days ago, from what I read it sounds like normal behavior... for an '03.

 

[DavidBurt]

Thats just the grid heater cycling, perfectly normal operation.

Dave B.

 

[JHardwick]

My '03 cycles the grid heaters for a minute or two as well, I can't say why the '06 only cycles for 20 seconds.



Does this happen on the same day, same temps etc?

 

[gitchesum]

Correct, it is reading outside air temp through the IAT(intake air temp) sensor.