Yes, positive post on the battery in the trunk. Blower on AC was on/off frequently. Sun shade on the roof would not close. Finally no voltage anywhere. Tested by connecting volt meter to the 12v outlet in the ash tray so that i could monitor voltage while driving. DC voltage appeared normal. Set the voltmeter on AC. Normal is about 0.02Volts while driving. If the AC voltage reaches 0.05V AC or higher strange things happen throughout the system,

Tried starting car after 5 days -no attempts... after GP lite goes off- tach bounced for about 2 seconds w/ chiming -- then tach went to zero...

cranked- for several seconds -no start... repeated- tach stopped bouncing--car fired up... let it idle for 30 minutes-- took around block a few times... parked
, idled 10 more minutes... shut off... restart--no issues... shut off

came back 10 minutes later... Bouncing tach/ w chime... NO CRANK NO START... attempted few times- finally one time Tach --NO BOUNCE cranked for several seconds--NO Start....

Now back- to several attempts--BUT ALL w Bouncy tach... so NO CRANK

wtf!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Sure sounds like an intermettiant connection either canbus or ground. I can't find my diagram of where the canbus connectors are all located. They all would need to be disconnected cleaned and repeated. And I'd be doing the same with all grounds too.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

I still think there may be a faulty connection somewhere. Remember there are many connections under the floor carpet on the passenger side where the floor slopes upward .