Think a starter or alternator may be failing? Here's a quick checklist of things to keep in mind and inspect for, courtesy of Clint Stohler, director of training/tech support for Remy Power Products, a manufacturer of new and reman starters and alternators.
Starters
Engine won't start
Defective fusible link
Loose connections
Defective ignition switch
Defective solenoid/mag switch, relay, neutral start switch or clutch switch
Could also be dead battery, mechanical problem in engine or problem in vehicle anti-theft system
Engine cranks too slow
Loose or corroded connections
Defective starter motor
Could also be weak battery or mechanical problem with engine
Starter keeps running
Damaged pinion or ring gear
Defective starter or magnetic switch
Defective ignition switch or control circuit
Starter spins but engine will not crank
Defective drive clutch
Defective starting motor
Alternators
No output, battery condition good, dashboard indicator light illuminates when key on engine off
Gregg Wartgow is a freelancer who Fleet Maintenance has relied upon for many years, writing about virtually any trucking topic. He lives in Brodhead, Wisconsin.
