Guardian Technologies 4758, 4456 TEST 47 - CHECK WIRE 56 VOLTAGE, Section, Diagnostic Tests, Part

SECTION 4.4

DIAGNOSTIC TESTS

PART 4

DC CONTROL

a.An average reading of 1.260 indicates the battery is 100% charged.

b.An average reading of 1.230 means the battery is 75% charged.

c.An average reading of 1.200 means the battery is 50% charged.

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).

Page 4.4-4