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Mag wire ID help

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17 years 1 month ago #8254 by nickspalding
Can anyone tell me if the wire in the picture is supposed to ever ground as the pony rotates? When I roll the pony over that wire gets an intermittent ground which I believe is the cause of my start and die problem. Anybody have any idea?

Thanks
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17 years 1 month ago #8256 by Old Magnet
Replied by Old Magnet on topic Mag wire ID help
I believe that wire is grounded all the time. That's the one you have to disconnect to do a continuity check across the points.

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17 years 1 month ago #8257 by ccjersey
Replied by ccjersey on topic Mag wire ID help
OM, Isn't the wire supposed to be grounded to the case, but when you lift it, the points should be making and breaking the connection to ground on the other end of the primary winding in the coil.

Once you lift the wire, and the points are open, you shouldn't have any further connection to the case, and a fairly low resistance through the coil primary circuit to the points. When the points close, you should have almost the same low resistance through the primary, the points and to the case.

the resistance through the coil secondary (spark output terminal to ground) should be a much higher value. K ohms on most mags.

Are you sure the points aren't gapped almost too wide or sticking when they get hot?

the condenser could also be bad. They're a lot cheaper than the coil.

Jim

D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time:D

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17 years 1 month ago #8259 by Old Magnet
Replied by Old Magnet on topic Mag wire ID help
CC, yes, it's as you describe. I thought that was what I was saying.

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