Guardian 4389 Repair Manual page 119

DC CONTROL
4. If the remote start connections have been used, discon-
nect the customer wires from the terminal connector at
Wire 178 and Wire 183.
5. Connect one meter test lead to Wire 178 at the terminal
connector. Connect the other meter test lead to Wire 183
at the terminal connector. INFINITY should be measured.
6. If the remote start connections have been used, connect
the meter test leads across customer supplied wiring. If
CONTINUITY is measured, customer supplied circuit is
causing startup.
RESULTS:
1. If CONTINUITY was measured in Step 5, a short
exists between Wire 178 and Wire 183. Repair or
replace Wire 178 and/or Wire 183 between terminal
connector and SW1.
TEST 75 - CHECK BATTERY VOLTAGE
CIRCUIT
DISCUSSION:
If the 15 amp fuse blows immediately after replace-
ment, Wire 15 should be checked for a fault.
PROCEDURE:
1. Set the AUTO-OFF-MANUAL switch to OFF.
2. Disconnect the 17-pin connector (J1) from the circuit
board.
3. Set a VOM to measure resistance.
4. Disconnect Wire 15 from the fuse holder (F1).
5. Connect one meter test lead to Wire 15 (removed from
fuse holder in previous step). Connect the other meter
test lead to the ground terminal. INFINITY should be
measured.
RESULTS:
1. If CONTINUITY was measured in Step 5, repair or
replace Wire 15 between the fuse holder (F1) and SW1,
or between SW1 and Connector J1.
2. If INFINITY was measured in Step 5, replace the circuit
board and retest.
TEST 76 - CHECK CRANKING AND RUNNING
CIRCUITS
DISCUSSION:
This test will check all of the circuits that are "HOT"
with battery voltage and which could cause the F1
Fuse to blow.
PART 4
PROCEDURE:
1. Set a VOM to measure resistance.
2. Disconnect the 17-pin connector (J1) from the circuit board.
3. Connect one meter test lead to the ground terminal.
Connect the other meter test lead to each of the follow-
ing J1 Connector pin locations:
J1-4, Wire 194
J1-5, Wire 56
J1-10, Wire 15A
J1-7, Wire 14
NOTE: (V-twins equipped with Wire 15 connected
to SCR) Disconnect Wire 16 from the Starter
Contactor Relay. Install new 15A fuse. Place
AUTO-OFF-MANUAL switch to MANUAL. If fuse
does not blow, repair or replace Wire 16 between
the SCR or the Starter Contactor (SC) located on
the starter.
Optional Test Method: Set VOM to measure DC
amps. Remove Wire 16 from the SCR. Connect the
positive (+) test lead to Battery Positive, Connect
the negative (-) test lead to Wire 16. The starter
motor should engage and crank. Nominal current
to Starter Contactor should be 4-5 Amps.
4. Disconnect Wire 194 from the terminal strip. Repeat
Step 3 at Pin Location J1-4.
a. If CONTINUITY was measured, Wire 194 is
shorted to ground between Connector J1 and
terminal strip.
b. If INFINITY was measured, disconnect Wire 194
from the transfer switch terminal strip. Connect
one meter test lead to the end of Wire 194
which was removed from the transfer switch ter-
minal strip. Connect the other meter test lead to
the ground terminal. If CONTINUITY was mea-
sured, Wire 194 is shorted to ground between
the generator and the transfer switch.
1) If INFINITY was measured, disconnect Wire
194 from the transfer relay (TR). Connect
one meter test lead to the transfer relay ter-
minal from which Wire 194 was previously
removed. Connect the other test lead to Wire
23 at the transfer switch terminal strip. If
CONTINUITY "ZERO RESISTANCE" was
measured, replace the transfer relay. Normal
coil resistance is approximately 113 ohms.
SECTION 4.4
DIAGNOSTIC TESTS
If CONTINUITY was mea-
sured, go to Step 4.
Average nominal resistance
reading: 110-120 ohms.
If CONTINUITY was mea-
sured, go to Step 5.
Average nominal resistance
reading V-twin (SCR): 150-
160 ohms, Single Cylinder
(SC): 4 ohms.
If CONTINUITY was mea-
sured, repair or replace
shorted to ground Wire 15A
between Connector J1 and
switch SW1.
If CONTINUITY was mea-
sured, go to Step 6.
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