RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN C (2002)
Mini ISO Relay: Testing and Inspection
Relay Circuit Test
Relay Circuit Test
1. The relay common feed terminal cavity (30) of the junction block or power distribution center is connected to battery voltage and should be hot at
all times. Check for battery voltage at the fused B(+) circuit cavity in the junction block receptacle for the relay. If OK, go to Step 2. If not OK,
repair the fused B(+) circuit to the Power Distribution Center (PDC) fuse as required.
2. The relay normally closed terminal (87A) is connected to terminal 30 in the de-energized position, but is not used for this application. Go to Step
3.
3. The relay normally open terminal (87) is connected to the common feed terminal (30) in the energized position. This terminal supplies battery
voltage to the fused B(+) fuse in the junction block that feeds the accessory when the relay is energized by the ignition switch. There should be
continuity between the junction block cavity for relay terminal 87 and the fused B(+) fuse in the junction block at all times. If OK, go to Step 4. If
not OK, repair the open fused B(+) circuit to the junction block fuse as required.
4. The coil ground terminal (85) is connected to the electromagnet in the relay. It receives battery feed to energize the relay when the ignition switch
is in the Accessory or Run positions. Turn the ignition switch to the ON position. Check for battery voltage at the fused ignition switch output
(acc/run) circuit cavity for relay terminal 85 in the junction block receptacle for the relay. If OK, go to Step 5. If not OK, repair the open fused
ignition switch output (acc/run) circuit to the ignition switch as required.
5. The coil battery terminal (86) is connected to the electromagnet in the relay. The junction block cavity for this terminal should have continuity to
ground at all times. If not OK, repair the open ground circuit to ground as required.
