Disclaimer: electronics are not my strong point, I'm going to try my best to describe what's happening and I do need help!
Car is an RF88 VD with Kent, used for autocross. Took it out to first event since last September two weeks ago. Car starts fine off plug in jumper battery (starter did sound a little "lazy" initially, then spun ok). Electronic tach working. Take car off of jumper battery, tach stops working, car keeps running. Shut it down, car won't restart off the on board battery, even though it was freshly charged...it just doesn't have enough to crank a full revolution. So, it starts fine off the jumper, won't start off the on board, tach only works when the jumper is plugged in.
Brought car home, recharged on board battery. Still won't turn over using on board. Hook jumper cables to on board. No luck. Disconnect on board battery and run jumper cables directly to +/- leads. No luck.
So, the car will start and run normally via the plug in circuit, but won't start/run on the circuit which originates at the on board battery, it would seem.
Thoughts? (before I start pulling the car apart to look for bad grounds or visible wiring issues).
I didn't mention, but the wiring is pretty fresh and I've had zero problems along these lines in the couple of years I've run the car. Also, the master switch was never wired correctly, as the car will continue to run even with the switch in the off position. So, I'm not thinking bad kill switch (?)
Thanks
Mike