[Morris]

Disconnect the positive side ...... and put the alternator feed on the disconnect switch ......on the battery side.....

If you disconnect the negative side .......the motor is spinning and the alternator will continue to have a output and seek a ground thru any other source.... or ground hooked to the motor......

So you won't be able to shut the motor off while it's running....... that is a must in all of the racing orgs.....

Morris