First off, let me apologize for the quality of my previous posts. We have our first big trip coming up and along with prepping the coach and looking for work, I have learned how much I didn't know about the GMC. I've been juggling several projects on the GMC at once, which has lead to some confusing communications from me. As I am getting things under control, my communication should be better. Bear with me.

Ok, my previous post about the PD9620 was probably a little confusing. So I spent a good bit of today crawling under the coach tracking down where the battery cables actually go. In the process I discovered black cables that were actually POSITIVE cables along with a bit of cable chaffing. None of the cables were chafed through yet, but it will be addressed in the near future.

I created a drawing of what I found: <pictures deleted>

On the right hand side of the circle (I forgot the name of the device that represents.) you will see the starting battery and circuit. All looks ok now especially since I replaced the black positive cable with a proper red one.

To the left you will see the generator and house circuits. The first battery to the left is in the front of the coach along side the starter battery and would be the house battery on my Royale. At the generator end I have the generator battery and the PD9620. On my Royale, the original converter and 12v fuse box were at the back, so the PD9620 is also located there. What created my confusion about the PD9620 was that the positive terminals on the generator battery in back and the house battery in the front are connected together feeding the PD9620. This prompted my question about how the unit could charge two distinct batteries. By the way, the connection of the positive side of the batteries looked like this:

I have cleaned that connection so there is no more corrosion bursting through the tape.

I purchased two 6v golf cart batteries today and discovered that there is not enough room up front for them, so I started thinking about putting them by the generator and feeding the house and generator off of this bank. This would give the PD9620 a common set of batteries to work with and I assume give me plenty of juice to camp with. Does this sound like the best way to go? If I did this and left the cable attached to the device whose name I forgot, would that still give me the power boost from the dash switch?

I don't doubt that the drawing (deleted) is accurate, but if it is, I already see about three problems.
All are easily remedied, and I would go on, but it is late here and I am tired.

Matt

This is the drawing use
http://www.gmcmhphotos.com/photos/how-to-check-out-your-own-electrics-gnc/p49207-isolate-charging-sourc.html
Erf

Bob -

Lookin' good, but I see a lot of 'green groady grot' growing on some of the crimped - on connectors. I recommend you take each connector off one at a time and shine it. If the wire going into the crimp cuff is also green, cut it back to clean copper and crimp on another connector. If there isn't enough slack, replace the wire. It's a pain, but corrosion in those crimp-ons is simply a problem waiting until you're in a hurry to surface and bite you.

--johnny
'76 23' transmode norris
Braselton GA