Generac Power Systems 53187 - Manual (Page 140)

SECTION 5.9
TROUBLESHOOTING TEST PROCEDURES
Test 22- Test Low Oil Pressure Switch
(Continued)
PROCEDURE (CONT’D);
1. Set a VOM to its “Rx1" scale and zero the m eter.
2. Unplug W ire 85 from the sw itch term inal.
3. Connect one VOM test lead to the pressure sw jtch
term inal; the second test lead to fram e ground. W ith
engine shut dow n, the m eter should read "continuity".
4. Crank and attem pt to start the engine. As the engine
cranks and attem pts to start, the pressure sw itch con­
tacts should open and the m eter should read "infinity".
RESULTS:
1. Replace the low oil pressure sw itch if it fails the tests.
2. If the pressure sw itch checks good, go to Test 23.
I
PARTS
ENGINE ELECTRICAL SYSTEM
Test 23- Test High Coolant Temperature
Switch
DISCUSSION:
The high coolant tem perature sw itch is connected
in parallel, in the sam e circuit as the low oil pressure
sw itch. Failure of the engine to start can be caused by
a defective tem perature sw itch.
PROCEDURE:
Referto "H igh Coolant T em perature Sw itch" In Part
5, Section 5.5 (Page 5.5-1).
RESULTS:
Replace tem perature sw itch if it is defective.
PAGE 5.9-8