Question about Harley Davidson XLH 1000 Sportster Motorcycles

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Soo,my 79 sporty with an 86 evo 1100,running great.2 weeks ago,pulled in on a bike ride about 3 hrs long.hot and rolling down a hill,just quits.got running again and ran for the entire evining.next morning,started it up and let it warm for about 2 mins.went to pull away and just quit again.now cant get it to start.no spark.changed coil,ignition mod is a brand new crane hi4.could there be a way to test the run switch.would the motor turn over if the run switch is malfunctioning.how can i test run it disabling that switch.

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Turn your ignition switch on, using a test light or volt meter, see if you have power to the coil. If you do, you should have power to your ignition unit. According to the wiring instructions from Crane, the power for the unit comes from the same wire as the power to your coil. The trigger wire goes to the other side of the coil. Then there's a wire for the VOES but this would not have anything to do with the unit functioning or not.

If you wish to test the "Run/Stop" switch, with the test light or voltmeter on the coil, and the switch in "Run", you should have power to the coil. Fllip the "Run/Stop" switch to "Stop", the voltage goes away. Some bikes will allow the engine to turn over with the switch in "Stop" position or if the switch is defective. On some bikes, the switch does not disable the starter.

Now, check your coil. Using the DVOM (digitial volt ohm meter), disconnect the wires on both sides of the coil. Put the meter in OHMS, R X 1 postition. Put one lead on each small terminal of the coil. Your meter should read between 2 and 3 ohms, with 2.7 being a typical reading. If it reads more or less than that, the coil is probably bad.

In the event you don't have a meter, there's a simplier way to test it. Leave the "HOT" side of the coil connected but disconnect the red wire from the ignition unit. Disconnect all the wires from the other side. Now, make up a jumper wire and connect it to the negative side of the coil. Turn the ignition on and MOMENTARILY ground it on the engine. When you take the wire loose from the ground, you should see a spark at the spark plugs.

I hope this helps.

Good Luck
Steve

Posted on Aug 20, 2010

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