| Sounds like yer battery mate. I don't trust these Optimates at all, in fact I'm fairly convinced the damn thing has already cooked two batteries.
I now charge the tiny battery on the RS the night before I go to the track, and take a Chuff off big car battery with me which connects into the system via an Anderson coupling to up the cranking current for cold starting. This can then be disconnected when the engine is running.
A YX7 isn't that pricey, get a new one! |