I was thinking this should be easy to find. I mean, just look under the car, around where the starter or battery ground cable goes, and I would eventually find a braided grounding strap.
No luck. Can anyone tell me where I can find it, and maybe you even have a picture, or diagram

 

Welcome to DF
The ground cable goes to the upper bolt of the starter, under the front motor mount bracket.

 

Yes, thank you. Found it. Looks oily and dirty. I will take it off, clean it up, and see where that gets me.
Got funny things going on in this Van lately. Sometimes windshield wipers don't work. Sometimes radio flickers. And now the interface to the ECU seems to be a bit messed up because I can't clear codes right now.
I haven't checked the voltage coming off the alternator yet, should probably do that too.
That is one pet peave about caravans. No voltage gauge on dash.