hi my name is mike i have a 1983 posche 944 and ive installed a GE 9 inch 36-48 volt motor out of a fork lift, clutchless, been driving it around with toggle switches and solinoids, ok i bought a logisystem 700 amp controller and it worked great for 10 minutes then poof nothing i just got it back from texas under warranty and now am afraid to conect it again i have 5 batteries 1 for the car 12 volt acc 4 deep cycles for the motor my question is should the motor batteries be grounded to the body as is the acc battery and is there any thing else that im not thinking of when driving with the solinoids the car would scratch the tires and go about 25 mph witch is ok for the speed limit in my town is 25 all over i can get it to go faster with more batteries to hold 48 volts but the wife said no more money yet any help would be greatful thanks thanks for the replies the motor housing is grounded through the mount but the battries are set only to the motor terminals and the controller i will try to get a picture on soon im only into this a little over 1000$ 500 for car 200 motor 330 controller plus a couple hundred for misc i built my own coupler from the clutch disc and ametal disc and 2 iron pipe flanges that i filled spline grooves in, alot of work but it cost 8$ and works shifting can only be done with foot off gas and my motor mount is an old exercise bike frame battery trays are metal shelves and bed frame angle iron. the controller never got hot before it died and logisystem sent it back with wiring diagram only no note