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DDIIAAGGNNOOSSTTIICC TTEESSTTSS
Figure 7-24. – Tachometer
TEST BRACKET:
A starter motor test bracket may be made as shown
in Figure 7-25.
Figure 7-25. – Test Bracket
REMOVE STARTER MOTOR:
It is recommended that the Starter Motor be removed
from the engine when testing Starter Motor perfor-
mance. Assemble starter to test bracket and clamp
test bracket in vise (Figure 7-26).
TESTING STARTER MOTOR:
1. A fully charged 12 volt battery is required.
2. Connect jumper cables and clamp-on ammeter as shown in
Figure 7-26.
3. With the Starter Motor activated (jump the terminal on the
Starter Contactor to battery voltage), note the reading on the
clamp-on ammeter and on the tachometer (rpm).
Note: Take the reading after the ammeter
and tachometer are stabilized, approximately
2-4 seconds.
4. A starter motor in good condition will be within the following
specifications:
MMiinniimmuumm rrppmm 44550000
MMaaxxiimmuumm AAmmppss 5500
Note: Nominal amp draw of starter in generator is
60 amps.
Figure 7-26. – Testing Starter Motor Performance
TEST 28- CHECK FUEL SUPPLY
DISCUSSION (GASOLINE MODELS):
If the engine cranks but won't start, don't overlook the
obvious. The fuel supply may be low. Many RV gen-
erator installations “share” the fuel tank with the vehi-
cle engine. When such is the case, the Installer may
have used a generator fuel pickup tube that is shorter
than the vehicle engine's pickup tube. Thus, the gen-
erator will run out of gas before the vehicle engine.
PROCEDURE:
Check fuel level in the supply tank. Attach a fresh fuel
supply if necessary and restart. Fuel may be stale,
causing a hard start.
RESULTS:
1. If necessary, replenish fuel supply.
2. If fuel is good, go to Test 29 (for Problem 7, Section 6).
Go to Test 32 for Problem 8 (Section 6).
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