Alternator voltage on ISC engine
I had an issue earlier in the year with low voltage on the alternator (12.2v). I cleaned the connections at the alternator and that fixed that. Now I notice the voltage will fluctuate from 14.2 do...
Forum Discussion
sch911 wrote:
Charge air heater grid cycling on/off with a cold engine?
THIS ^^^^^^
ISC is a Cummins Diesel
Cummins uses 'grid heaters' vs 'glow plugs'
Voltage WILL fluctuate from 14V to 12V when ambient air temps drop below 59*F
They will continue to cycle on/off (up to 30 seconds) until intake manifold temp goes above 59*F---even with engine running
Each grid heater pulls close to 95A...thats 2300W
Just one of the reasons for dual batteries and high amp alternators
