The solenoid I thought was bad but nope,it just will every now and then turn over ,its not getting ground to starter relay as when all is connected it shows 12 volts on brown wire with starter button pushed and 12 +volts on black wire.I changed starter relays,checked all fuses ,by passed everything and went with 12 volts to starter it spins fine,any ideas ?also what could go wrong if battery was put in backwards +to- etc,before it was brought to me???thanks in advance>Marvin