Originally Posted by Kelm130
After following another post in the Cat engine forum I thought I check over here with the Winne gang.
Having a charging issue again when all was well for a while last year. Here is what all I did to it:
- New Coach batteries early 2015
- New Alternator at the Cat shop Fall 2015 - Good charge afterwards
- Regular service at Gaffney - New serpentine belt installed in Dec. Drove it home to Knoxville no bad charge indicators.
- Got home and replace 3 house batteries
- Took to RV dealer for winterizing and batter light came on - Low charge on ScanGuage.Thought it was just the cold weather.
- Took to RV dealer for awning issue - Low battery again
When I drive ScanGauge shows barley 12 volts but when I turn on the genny it jumps to 13+.
So I'm thinking a loose belt, bad ground or bad isolator. Unfortunately I don't have anywhere to work on it so it's at the Cat dealer today getting looked at.
Could I have done wrong something when I changed the house batteries? I wouldn't think they would cause any issues with the engine charging system but thats when it seems like my troubles started.
Thanks for any insights!
May I ask? :
1. Forget the Scangauge, what are the voltage readings, right at both the house batteries and, the chassis batteries, while the engine is running?
2. Has there been any alterations to the shore power/generator/Inverter/charger side of charging the house batteries? By that I mean, in pre-'05 years of Winne and Itasca, there was no provisions for the shore power to charge the chassis batteries from either of those two makes.
3. After around mid to late '05, a "Trik-L-Start" unit was installed to take care of charging the chassis batteries while on shore power.
4. Is your coach starting fine, even when you see the "Low voltage" sign?
Now, there is an "Auxiliary Boost" switch (maybe) in or on your dash someplace that, does handle both linking up the house batteries to the chassis batteries for augmented cranking power if and when needed.
But, that Auxiliary boost switch activates a solenoid that does all the work. And, that solenoid also automatically closes, to provide charging to the house batteries from the alternator, when the engine is running.
So, with all that said, this is why I ask about what kind of voltage you see, right at the battery posts, of both sets of batteries, while the engines is running. There's more to check but, that's a starting point.