I just can't let this thread die away like that. I am a faithful follower of Brother Ohm, we're old friends. Voltage in a truck certainly should be constant, but current usually isn't. That's why we have fuses. If current were constant we would never pop fuses. It all depends on what a circuit is drawing, and if it is drawing too much that can depend on a lot of things, that is where a good troubleshooter comes into the picture, and that is why I follow these posts. I must be misunderstanding Beltfed here, I am sure he is ten times the troubleshooter that I am, but it really doesn't matter because we are way off the original topic.
The question here was about charging an 8 volt battery, not about wiring for headlights and Ohm's law. And I have current personnal experience with an 8 volt battery. Once in desperation I even tried charging it with the trickle charger for my MC. I charged the battery for 2 days without a noticeable effect, then I borrowed a big grown-up charger (which I still have not returned after a year) and after a few hours had a charge on the battery that started the truck.
So, it is possible to charge an 8 volt battery with a 6 volt car battery charger. In my experience the voltage of the charger is not the problem. I would guess that the problem was that the trickle charger was a 1 amp device, the big charger a 20 amp. When charging a MC battery the trickle charger is still supposed to charge overnight, I think it said over 12 hours for that dinky little battery. Maybe it would work to charge a car battery with a trickle charger if it sat and charged for a week.
So here is a follow up question: has anyone successfully charged a 6 or 12 volt car battery with a trickle charger?
