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Farmall & IHC Tractors Discussion Forum
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Re: Farmall M No spark Trouble shooting guide

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Nate V. IA

06-19-2013 17:52:35
216.51.200.72



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Update for John T

I have new points and condensor installed. No spark at the points. No spark jumping from coil wire that goes to distributor cap when held 1/8in from block.

I have 6v on the meter when I go across the - to + coil.

Test light on the neg wire from the coil (unhooked from dist.) lights bright when the key is on and when cranking it just dims, it doesn't flash on and off.

Test light on the neg wire from the coil (hooked to dist.) doesn't light up at all when cranked.

GordoSD the ballast is under the gas tank.

Thanks
Nate

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John T

06-19-2013 18:46:20
216.249.76.176



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 Re: Farmall M No spark Trouble shooting guide in reply to Nate V. IA, 06-19-2013 17:52:35  
If alllllllllll is well and you place a test lamp on the coils + input and turn IGN ON it should always be lit and a voltmeter should read around 6 volts if points are good and closed cuz the ballast drops the other 6 volts......or 6 volts across coil itself + to -

Now place test lamp over on the coils - side (other lead to grolund) with it still wired to distributor and turn on ign and slowlyyyyyyyy turn the engine over.

LIGHT SHOULD FLASH ON WHEN POINTS OPEN

LIGHT SHOULD GO OFF WHEN POINTS ARE CLOSED

IF ITS SLOWLY CRANKED LIGHT MUST FLASH ON (points open) AND OFF (points closed)

If the wire to distributor isnt connected a test lamp on coils - output should always lite as 12 volts is present

If you work through my troubleshooting procedure the cause can be determined.... Points must close and open to first conduct coil current to ground then open to stop current flow so coil fires.

If the light never goes out (should when points close) the points are bad or not closing or a wires bad/open......If the light on coils - never comes on,,,,,Points may not be opening or condensor is shorted out or theres a short or the coils LV primary is bad/open

John T

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