Relay Inspection

1. Remove the MFI relay.

MFI Relay:

2. Check for continuity between MFI relay terminals.

Terminal No. Continuity

5 - 7 Conductive (approx. 90 ohms)
6 - 8 Conductive only one direction





3. Using jumper wires, connect terminal 7 of MFI relay to battery + terminal and terminal 5 of MFI relay to battery - terminal.

Caution: If jumper leads are not connected properly the relay will be damaged.

4. Connecting and disconnecting the jumper wire to battery - terminal, measure the voltage at terminal 1 of the control relay.

Jumper wire Voltage

Connected B+
Disconnected 0 volts





5. Using jumper wires, connect terminal 8 of MFI relay to battery + terminal and terminal 6 of MFI relay to battery - terminal.
6. Connecting and disconnecting the jumper wire to battery - terminal, check the continuity across terminals 2 and 4 (or 3 and 4) of the MFI relay.

Jumper wire Continuity across Continuity across
terminals 2 and 4 terminals 3 and 4

Connected Conductive (0 ohms) Conductive (0 ohms)
Disconnected Nonconductive Nonconductive
(infinite ohms) (infinite ohms)

7. Replace the MFI relay if any defect is evident.