Thor Forums

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Originally Posted by Rysiek

The generator is not cranking over at all. But as soon as I start the coach's engine it starts flawlessly abd right away

No, the batteries never reached 13.7 VDC. After being plugged in to SP for about16 hours the batteries were at 12.7 VDC.

I assume you are measuring house batteries at the batteries location? If Your house batteries never went over 12.7 VDC when plugged into SP then either your converter is bad or you have a disconnect between the converter and the house batteries. That disconnect could be:

The large reverse polarity fuses on the fuse DC distribution panel.
The USE/STORE/Battery Disconnect latching relay OPEN.
The 50 Amp DC breaker tripped.

Originally Posted by Rysiek

It is a big time scratcher. Thank you for your help.
Here are some answers:
1. Yes, I have tried starting the gen right on gen. Primed the gen first as well.

2. After coach is running for few minutes the DC voltage reads 13.7 DC.
What DC voltage? What/Where are you measuring this?

Trace the main power positive cable from the house batteries, through the 100 Amp DC breaker (verifying it is not tripped) to the generator. Without the engine running; what is the voltage from this positive lead at the generator to ground?

If you have the same voltage as you have on the house batteries (12. VDC at best), continue to measure this voltage while someone pushes the generator start button. If it goes below 10 VDC you have bad batteries.