Need (3 - 12V) wiring diagram for melex 112
 

Boss said he won't buy 6 6volt batteries because they are too expensive. So, I'm stuck with a cart to haul manure in that keeps an all-night charge for 15 minutes in the morning.
Yesterday, it was sparking at the contact points - and I don't mean "sparkler" type of sparks - I mean blue and yellow shooters! Right under my delicate butt!:lhmo:

So, if anyone uses 3 12v, could you please help me out with a wiring diagram - everytime the "handyman" works on it, it gets worse.

Thanks everybody.