Bryant ASPAS1BBA015 - Manual (Page 100)

Page 100
SECTION 4.4
DIAGNOSTIC TESTS
d. An average reading of 1.170 indicates the
battery is 25% charged.
C. Test Battery Condition:
1. If the difference between the highest and lowest
reading cells is greater than 0.050 (50 points),
battery condition has deteriorated and the
battery should be replaced.
2. However, if the highest reading cell has a
specific gravity of less than 1.230, the test for
condition is questionable. Recharge the battery
to a 100 percent state of charge, then repeat the
test for condition.
RESULTS:
1. Remove the battery and recharge with an automotive
battery charger, if necessary.
2. If battery condition is bad, replace the battery with a new
one.
TEST 47 - CHECK WIRE 56 VOLTAGE
DISCUSSION:
During an automatic start or when starting manually,
a crank relay (K1) on the circuit board should
energize. Each time the crank relay energizes, the
circuit board should deliver 12 volts DC to a starter
contactor relay(SCR) and the engine should crank.
This test will verify (a) that the crank relay on the
circuit board is energizing, and (b) that circuit board
action is delivering 12 volts DC to the starter
contactor relay.
PROCEDURE:
1. Connect the positive (+) test probe of a DC voltmeter (or
VOM) to the Wire 56 connector of the starter contactor
relay (SCR, on models with v-twin engines) or the
starter contactor (SC, on models with single cylinder
engines). Connect the common (-) test probe to frame
ground.
2. Observe the meter. Then, actuate the Auto-Off-Manual
switch to MANUAL position.
a. The circuit board crank and run relays should
energize.
b. The meter should indicate battery voltage.
3. Insert the positive (+) meter test lead into Pin 5 of the
circuit board connector J1. Connect the common (-) test
lead to a clean frame ground. Then, repeat Step 2.
a. The circuit board's crank and run relays should
energize.
b. The meter should read battery voltage.
Figure 4. The Wire 56 Circuit
RESULTS:
1. If battery voltage is indicated in Step 3, but not in Step 2,
Wire 56 (between the circuit board and starter contactor
relay or starter contactor) is open. Repair or replace this
wire as required.
2. If battery voltage is not indicated in Step 3, go to Test
43.
3. If battery voltage is indicated in both Steps 2 and 3, but
engine does not crank, go on to Test 49.
TEST 48- TEST STARTER CONTACTOR RELAY
(V-TWIN ONLY)
DISCUSSION:
The starter contactor relay (SCR) located in the
control panel must be energized for cranking to occur.
Once the SCR is energized, it’s normally open
contacts will close and battery voltage will be
available to Wire 16 and to the starter contactor (SC).
Figure 5. The Starter Contactor Relay
PROCEDURE:
1 Set a VOM to measure DC voltage.
COM NO
16 15
56 0
15
16
0
56
PART 4
DC CONTROL