Guardian Technologies 4759, 4456, 4390, 4389 Test 45- Check 15 AMP Fuse, Test 46- Check Battery

DC CONTROL

PART 4

SECTION 4.4

DIAGNOSTIC TESTS

7.Connect the positive (+) test lead to the AUTO-OFF- MANUAL switch Terminal 4, Wire 17/178. Connect the negative (-) test lead to a clean frame ground. Battery voltage should be measured.

8.Connect the positive (+) test lead to Pin location 11, wire 17 at the J1 connector on the circuit board. Connect the negative (-) test lead to a clean frame ground. Battery

TEST 45- CHECK 15 AMP FUSE

DISCUSSION:

The 15 amp fuse is located on the generator console. A blown fuse will prevent battery power from reaching the circuit board, with the same result as setting the AUTO-OFF-MANUALswitch to OFF.

voltage should be measured.

9.Set a VOM to measure resistance "R x 1" scale. Connect one meter test lead to a clean frame ground. Connect the other test lead to Pin location 13, Wire 0 at the J1 connector on the circuit board. CONTINUITY should be measured.

PROCEDURE:

Remove the 15 amp fuse (F1) by pushing in on fuse holder cap and turning the cap counterclockwise. Inspect the fuse visually and with a VOM for an open condition.

RESULTS:

RESULTS:

1.No battery voltage in Step 2. Go to test 45 or repair/replace Wire 15 from F1 to SW1.

2.No battery voltage in Step 3. Go to Test 43 or repair or replace Wire 15A from Terminal 1 to Terminal 3 of SW1.

3.No battery voltage in Step 4. Verify Step 2 and repair or replace wire 15 from SW1 to J1 connector.

4.No battery voltage in Step 5. Go to Test 43 or repair or replace Wire 15A from SW1 to J1 connector.

5.If battery voltage is available in Step 8 but NOT in Step 7, repair or replace Wire 17 from SW1 to J1 connector.

6.If battery voltage is available in Step 7 but NOT in Step 6, go to Test 43.

7.If CONTINUITY is NOT measured in Step 9, repair or replace Wire 0 between the J1 connector and the 8-tab ground terminal.

8.If battery voltage is available in Steps 1-5 but NOT in Step 8 of Problem 2 flow chart, replace or repair the circuit board.

9.If battery voltage is available in Steps 1-5 for Problem 1 flow chart, replace the circuit board.

Figure 3. Wires 15A

1.If the fuse if good, go on to Test 46.

2.If the fuse is bad, it should be replaced. Use only an identical 15 amp replacement fuse.

3.If fuse continues to blow, go to Problem 16.

TEST 46- CHECK BATTERY

DISCUSSION:

Battery power is used to (a) crank the engine and (b) to power the circuit board. Low or no battery voltage can result in failure of the engine to crank, either manually or during automatic operation.

PROCEDURE:

A.Inspect Battery Cables:

1.Visually inspect battery cables and battery posts.

2.If cable clamps or terminals are corroded, clean away all corrosion.

3.Install battery cables, making sure all cable clamps are tight. The red battery cable from the starter contactor (SC) must be securely attached to the positive (+) battery post; the black cable from the frame ground stud must be tightly attached to the negative (-) battery post.

B.Test Battery State of Charge:

1.Use an automotive type battery hydrometer to test battery state of charge.

2.Follow the hydrometer manufacturer’s instructions carefully. Read the specific gravity of the electrolyte fluid in all battery cells.

3.If the hydrometer does not have a "percentage of charge" scale, compare the reading obtained to the following:

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