Check out some tips on testing starters and alternators from Delco Remy in the PDF below
This manual provides diagnostic procedures that can be used for troubleshooting a heavy duty electrical system, including the starting and charging systems. Some procedures also may be used for preventative maintenance checks. These procedures are applicable to systems using heavy duty starters such as: Delco Remy 28MT™, 29MT™, 31MT™, 35MT™, 37MT™, 38MT™, 39MT™, 41MT™, 42MT™, 50MT™ or a similar starter with adequate battery power for the engine/starter application used
Posted: Fri 15 May 2020