With Automatic Temperature Control

1. Disconnect wire connector at clutch.
2. Connect negative terminal of an ammeter to one of the field coil terminals, then connect a jumper wire from a suitable ground to the other terminal.
3. Connect a jumper wire to positive terminal of ammeter and connect other end of jumper wire to battery positive terminal.
4. With engine running and at operating temperature, current draw should be approximately 3.44 amperes. An audible click should be heard, indicating clutch engagement. If intermittent coil operation is suspected, maintain current draw test for 5 minutes or longer if necessary.
5. If current draw is not within specifications, replace magnetic clutch field coil.