I do not usually encounter IMS on starters. I take care of a small fleet of Freightliner Medium Duty trucks and the 28MT, 29MT and the 41MT starters they use don't have the IMS. Years ago we had a International MD truck with a IMS.
I came across this set of instructions for a 28MT starter.
NOTICE! Some applications use a starter with a magnetic switch (relay) directly attached. Replacing it with a starter without an attached magnetic switch (relay) is not recommended, because it requires installing a separately mounted magnetic switch (relay) and potentially upgrading the solenoid control circuit wiring. The switch and wiring must meet or exceed a current rating of 300 amperes for 12V starters and 200 amperes for 24V starter.
I do not understand the 300 amp wiring requirement for solenoid control. My Sierra starter solenoid draws a total of 18 amps (pull in + hold) current and the 28MT draws 58 amps (pull in + hold). Even the 41MT starter, which is a monster starter weighing about 80 lbs, draws 75 amps (pull in + hold).
300 amp wiring requirement for a 58 amp current draw seems unreasonable and overkill.
I came across this set of instructions for a 28MT starter.
NOTICE! Some applications use a starter with a magnetic switch (relay) directly attached. Replacing it with a starter without an attached magnetic switch (relay) is not recommended, because it requires installing a separately mounted magnetic switch (relay) and potentially upgrading the solenoid control circuit wiring. The switch and wiring must meet or exceed a current rating of 300 amperes for 12V starters and 200 amperes for 24V starter.
I do not understand the 300 amp wiring requirement for solenoid control. My Sierra starter solenoid draws a total of 18 amps (pull in + hold) current and the 28MT draws 58 amps (pull in + hold). Even the 41MT starter, which is a monster starter weighing about 80 lbs, draws 75 amps (pull in + hold).
300 amp wiring requirement for a 58 amp current draw seems unreasonable and overkill.
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