Proheat M80 - Manual (Page 59)

PROHEAT G-I PCM SERVICE MANUAL 4-28
Procedure – Mechanical inspection and testing:
a) Connect the power directly to the Coolant Pump. Observe the operation.
If the Motor does not operate, replace the Coolant Pump.
WARNING
NEVER remove coolant lines when
the engine is hot – escaping steam
or scalding water could cause
serious personal injury. Loosen the
coolant line clamps slowly,
allowing the pressure to escape
before removing completely.
Figure 4-34: G-I PCM Coolant Pump Output Voltage Measurement
A B
RED (+) BLACK (-)