We have a RM250C s/n AWG00257, While grinding in auto mode we have no low range or sensitivity adjustment. Med and High will work in Auto mode but still no sensitivity adjustment. I have checked for any loose wires in the control housing, did not see any loose or broken wires. So I do not where else to check. Any help or advise would be greatly appreciated. Thanks, Rick
you need to remove the allen headed grubscrew under neath the cover and calibrate the alternator voltage as per the proceedure in the workshop manual. a prestolite alternator requires different settings say compared to a delco so if alternator gets changed you need to recal with a voltmeter.