Re: 841 Powermaster Electrical Help

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Posted by Bob in Ks on August 31, 2022 at 09:02:26 [URL] [DELETE] :

In Reply to: 841 Powermaster Electrical Help posted by jrobin1 on August 30, 2022 at 13:31:26:

"When I check it there is 12v+ at every checkpoint all the way to the distributor."

Both your "12 volt, external resistor required" coil and the resistor should measure about 1 1/2 ohms. A 3 ohm resistor is too much and will likely cause harder starting and weaker spark problems.

When you check those low resistances, short the 2 ohm meter probes together and note the resistance. Then measure the resistor and subtract the shorted probe resistance. That should give you the resistance of the resistor.

With points open you should read near battery voltage all the way to the input of the distributor.

With points closed you should read near battery voltage at input to resistor, about half that voltage between resistor and input to coil, and zero volts at side of resistor.

Thus your measurements indicates the points are not closed with good contact when measurements were taken.

The quality type of your meter can have an effect when trying to measure operating voltages.

I would agree with Bruce's suggestion to get a direct 12 volt, "no external resistor required" coil (approx. 3 ohms across primary posts)and eliminate the resistor.


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