Bryant ASPAS1BBA007, Diagnostic Repair Manual, Page: 103 / 144

SECTION 4.4
DIAGNOSTIC TESTS
DC CONTROL
Figure 11. Check Pinion Gear Operation
(Single Cylinder)
TOOLS FOR STARTER PERFORMANCE TEST:
The following equipment may be used to complete a
performance test of the starter motor:
• A clamp-on ammeter.
• A tachometer capable of reading up to 10,000 rpm.
• A fully charged 12-volt battery.
MEASURING CURRENT:
To read the current flow, in AMPERES, a clamp-on
ammeter may be used. This type of meter indicates
current flow through a conductor by measuring the
strength of the magnetic field around that conductor.
Figure 12. Clamp-On Ammeter
TACHOMETER:
A tachometer is available from your Generac Power
Systems source of supply. Order as P/N 042223. The
tachometer measures from 800 to 50,000 RPM,
Figure 13.
Figure 13. Tachometer
TEST BRACKET:
A starter motor test bracket may be made as shown
in Figure 14. A growler or armature tester is available
from an automobile diagnostic service supplier.
Figure 14. Test Bracket
REMOVE STARTER MOTOR:
It is recommended that the starter motor be removed
from the engine when testing starter motor
performance. Assemble starter to test bracket and
clamp test bracket in vise, Figure 15.
TESTING STARTER MOTOR:
1. A fully charged 12 volt battery is required.
2. Connect jumper cables and clamp-on ammeter as
shown in Figure 15.
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.
PART 4
Page 103