Posted by Steve@Advance on August 08, 2018 at 08:38:21 from (24.182.105.179):
In Reply to: farmall 130 no start posted by yeld on August 08, 2018 at 07:58:01:
First, check for spark at the coil tower. Should give a 1/2-3/4" blue spark. If good there, something is wrong with the spark delivery. Even with new cap and rotor, it's aftermarket, anything is possible.
To check the ignition, disconnect the wire from the distributor side of the coil, ground the coil terminal with a jumper wire.
Turn the ignition switch on, read the voltage on the ignition side of the coil.
If it has a resistor, should be around 6 volts, if no resistor near battery voltage. Try cycling the ignition switch several times, be sure the voltage is steady and only drops when the switch is off.
Reconnect the distributor side wire. Connect a test light or analog volt meter from the distributor side coil terminal to ground, spin the engine through. The light should flash or the meter drop each time the electronic switch closes and opens.
If no light or voltage, there is a short in the ignition module or the wiring between the module and the coil.
If the light stays on steady, or the voltage stays high, the module is open or the wiring between the module and coil is open, or the module has lost it's ground.
If the light only dims, or the voltage doesn't drop to zero, the module is failing or has a weak ground. Seldom will a module fail, usually work or don't.
Be sure the trigger is in place, and the distributor is turning.
There is also a separate power supply to the module. Be sure it is getting battery voltage anytime the ignition is on.
If this is a Pertronix they have good customer service and troubleshooting.
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