Section 7

DIAGNOSTIC TESTS

to Step 2. If the unit does not produce spark or has weak spark go to Step 4.

2.Do the following:

a.Set a VOM to measure resistance. Connect the positive (+) meter test lead to Wire 18A (Wire 18A still removed from the J1 connec- tor) Connect the negative (-) meter test lead to a clean frame ground. “Infinity” should be measured, or 0.5 to 1M ohms, depending upon the type of VOM used. If “Continuity” is measured proceed to Step 12.

b.Set a VOM to the diode test range. Attach the negative (-) meter test lead to Pin Location J1-14 on the Printed Circuit Board. (Wire 18A still removed from the J1 connector) Attach the positive (+) meter test lead to frame ground. Set the Start-Stop Switch to “start”. “Infinity” should be measure during crank- ing and running. If the VOM does not have a diode test range, set VOM to measure resis- tance again. “Infinity” should be measured.

3.If Step 1 produced spark and Step 2 tested good, set the VOM to measure DC voltage. Connect one test lead to Wire 15 (J1-4) on PCB. Connect the other test lead to frame ground. Battery voltage should be measured. Verify that Wire 15 is con- nected to J1 and that Wire 14 is connected to J1- 5; if reversed the unit will produce no spark.

4.Rotate the flywheel until the magnet is under the module (armature) laminations (see Figure 7-37).

5.Place a 0.012-0.015 inch thickness gauge between the flywheel magnet and the module laminations.

Figure 7-37. – Setting Ignition Magneto

(Armature) Air Gap

6.Loosen the mounting screws and let the magnet pull the magneto down against the thickness gauge.

7.Tighten both mounting screws.

8.To remove the thickness gauge, rotate the fly- wheel.

9.Repeat the above procedure for the second mag- neto.

10.Repeat Test 55 and check for spark across the spark tester gap.

11.If air gap was not out of adjustment, test ground wires.

12.Set the VOM to the diode test position. The meter will display forward voltage drop across the diode. If the voltage drop is less than 0.7 volts, the meter will “Beep” once as well as display the voltage drop. A continuous tone indicates “Continuity” (shorted diode). An incomplete circuit (open diode) will be displayed as “OL.”

13.Disconnect the engine ground harness from the ignition magnetos and stud connector (see Figure 7-38).

Results:

1.If “Infinity” was not measured in Step 2b, replace the Printed Circuit Board.

Note: If VOM was set to Diode test, a reading of

0.5volts would be observed when the Start-Stop Switch is set to “STOP”. If the VOM was set to resistance, a reading of 0.5 to 1.5M ohms would be measured. During cranking and running this reading should go to “Infinity”. Verify that the meter leads were properly connected as per Step 2 instructions.

2.If battery voltage was not measured in Step 3, reconnect Wire 15 and Wire 14 to their correct terminal locations.

 

C

ENGINE

NEGATIVE METER

TEST LEAD

GROUND

 

HARNESS

B

 

 

A

 

POSITIVE METER

 

TEST LEAD

Figure 7-38. – Engine Ground Harness Test Points

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Generac Power Systems 5414, 5412, 5411, 5413, 5415, 5410 manual Setting Ignition Magneto Armature Air Gap
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5410, 5414, 5415, 5413, 5411 specifications

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