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Allan G Offline OP
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Hi All,

Please can anyone tell me what is the accepted secondary resistance for 6v (2 ohm) coils? I'm seeing 8.56kOhm and 8.72kOhm across each coil. The primary resistance is fine at 2Ohm but I cannot find any spec date for the secondary resistance. Coils are being used with Pazon Surefire.


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The answer is just use them.

The secondary resistance reading should be a figure in kilo ohm and two coils of the same type should give a similar reading. So what you’ve got sounds fine.


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Allan G Offline OP
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Thanks TT,

I suspected they were ok but at present I am just trying to track down an issue where when the bike is revved the main harness fuse pops ( I have a seperate fuse for the reg/reg Boyer powerbox 3 phase and have removed this incase there was an issue there) everything on the bike is new, including new motobat battery. I'll track the problem down, just need to get a few hours to be able to do it.

I was thinking that the coils could have an out of limits value for the secondary resistance and that causing the issue.


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I don’t think the secondary windings can blow your fuse, unless short circuited in a way that would not give the readings you are seeing.

I don’t think any circuit with kilo ohm resistance values can blow your fuse.


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What is the amp rating of the fuse that blows?


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Allan G Offline OP
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Is 15A modern blade type fuse, I haven’t had chance to completely isolate all other components as yet. Although they work fine (lighting etc) without the engine running and have not had them switched on whilst the engine is running.


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Maybe something is touching the frame or the inside of the headlight shell as vibration increases. Sometimes something inside a handlebar switch shorts to the bar; sometimes the tank nips a wire against the frame.

While you investigate, by carefully examining and pushing and pulling things, you can wire a small bulb in place of the fuse.


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Allan G Offline OP
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Thanks TT, I’m not ruling anything out at the minute. I was going to disconnect the rest of the loom and wire the Pazon direct and go from there initially and see what happens.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)


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