When in operation, the pre-heater requires good engine ground. However, the alternators are not grounded through the case, limiting the ground for engine electrical components. The pre-heater amperage can then ground to the steel braided air compressor hose...
Electrical system
Spartan IC Chassis Electrical problems by year
0 complaints filed with NHTSA about the Spartan IC Chassis's electrical system. Dead batteries, warning lights, wiring, alternators, infotainment and electronic module failures.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked daily. Complaints are owners' own reports and are not verified. How we use the data