Simplicity 1691766, Service & Repair Manual

Page: 64 / 240

5 Electrical Troubleshooting
Interlock Module / Headlight Tests
5 - 20
Figure 37. Headlight Switch Location
A. Headlight Switch
Figure 35. Interlock Module Location
A. Interlock Module
Figure 36. Headlight Assembly
H. Interlock Module
If all other switches, connectors, wires, and cables have
tested OK, the interlock module is at fault and must
be removed and replaced. The module is not
testable. However, if available, a known-good mod-
ule can be used to test the system.
1. Unplug and remove the old module (A, Figure 35).
2. Substitute the know-good module for the old module.
3. Turn the ignition switch to START. If the engine turns
over, the old module is bad and must be replaced.
5. MISCELLANEOUS TESTS
A. Test Headlight Bulbs
1. Remove the headlights from the headlight assembly
by twisting the socket counterclockwise and pulling it
out of the reflector assembly.
2. Visually inspect the bulb. If the element is burned
out, replace the bulb.
B. Test Power to Headlight Circuit
1. Turn the ignition switch to ON (RUN) and the head-
light switch OFF.
2. Set VOM to VDC. Touch the negative probe to
ground. Use the positive probe to probe the white /
black wire of the headlight switch plug (see Figure
37). The VOM should read battery voltage. If not,
check the ignition switch and all connections and
wires.
3. Turn the headlight switch ON.
4. Probe ground and the white/green plug on the back
of the switch. The VOM should read battery voltage.
If not, check the headlight switch (see TEST HEAD-
LIGHT SWITCH).
A
A