irratic altanator/ charging
#1
irratic altanator/ charging
I have a 99 ram 3500 with a very unstable charging system.it goes from not charging to over charging. You can see the flutter in all of the lights
#9
Okay, Not to but in, BUT Most likely you are loosing charge if it's occuring over 190 simply because the IAT would have cut the grid heater off by then. There again, Very common problem we see is a bad ground at the PCM , Incorrect IAT Reading or Damaged PCM. The truck should charge around 13-14 volts REGARDLESS of RPM based only on the PCM's Controls is the alternator switched on or off. The first place to check is the voltage it's really producing. If you want to confirm a grid heater/Amp/Volt issue, just unhook the grid. These trucks alternators are PCM Regulated.