Chassis battery issues
The Coachis a 2000 Newmar with a Spartan chassis. we tried to start the 8.3 cummins after 2 weeks on house power, and it cranked slow, did the boosted start and it started, OK but now the yellow c...
Forum Discussion
Today I had time to play with it, here is what I found.
the 2 chassis batteries have sat for 3 days with out being hooked to house power, they measure 14.8 volts.
the coach still cranks slow, voltage to the starter is 13.5 volts while cranking(hot), 9+- when cold.
the difference is when it is hot or cold.
when hot it pulls 450 amps when cold it pulls 650 amps, (I have inductive pick up amp meters)
I think it is the starter solenoid having a high resistance it works when hot not when cold.
when the starter pulls high AMPs the voltage drops to 9 +- and the computer senses it and turns on the check engine light, thinking the alternator has failed.
I still may have the batteries checked by the high current draw method to see if they fail.
the 2 chassis batteries have sat for 3 days with out being hooked to house power, they measure 14.8 volts.
the coach still cranks slow, voltage to the starter is 13.5 volts while cranking(hot), 9+- when cold.
the difference is when it is hot or cold.
when hot it pulls 450 amps when cold it pulls 650 amps, (I have inductive pick up amp meters)
I think it is the starter solenoid having a high resistance it works when hot not when cold.
when the starter pulls high AMPs the voltage drops to 9 +- and the computer senses it and turns on the check engine light, thinking the alternator has failed.
I still may have the batteries checked by the high current draw method to see if they fail.
