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Re: Multimeter issues with coil readings-resistor questions

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Author  [Modern View]

01-19-2013 18:22:32

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Come on. If my coil had 4000 ohms, would you say that? If it had 20 ohms, would you say that? I'm trying to understand what's best here, and how to do this. Just telling me to ignore the details doesn't seem the way to go...

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01-19-2013 18:48:01

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 Re: Multimeter issues with coil readings-resistor questions in reply to Eriklane, 01-19-2013 18:22:32  
Jmor's telling you correct.

your readings are erronious or you are taking the measurements wrong.. or the meters are malfunctioning.

primary resistance on a front mount coil will be a little less than an ohm up to 2.5 ohms if it is a 12v coil.. no way it is 1.2K ohms,. sorry.. just not possible on a running machine. primary is what purrent passes thru to the points. if it wqas 1.2k the tractor would never ever start.

top or pig tail to the flat tang.. now that WILL be in the 'K' range. exact amount may vary. i'd say 4k on that coil may be reasonable.

you can believe 2 engineers.. or you can choose not to. don't matter to me. my tractors all start and run, and I understand how a kettering ignition system works...

ball in your court...

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01-19-2013 18:31:15

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 Re: Multimeter issues with coil readings-resistor questions in reply to Eriklane, 01-19-2013 18:22:32  
Quoting Removed, click Modern View to seeMeasuring low resistance values "accurately" is not simple or easy. Just your test leads, the resistance of the contact between probes & coil terminals can swamp the low number that you are trying to read. A very good reading can be made by using a power source and two meters. Power the primary through an ammeter with one set of leads and connect a voltmeter with a second set of leads directly to coil primary terminals and read amps & volts. Divide , V/I to obtain Ohms.

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