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MSD coil restistant

Posted By: racerx

MSD coil restistant - 10/10/19 04:28 PM

Anyone here test coils ? curios what type of resistant you all getting? The coil in ? is a MSD pro coil.
Posted By: Cab_Burge

Re: MSD coil restistant - 10/10/19 05:19 PM

Is that the little red on?
I have several I can check for you if so up
I have several MSD race coils from the early Mallory to one of the newer transformer type shruggy
Posted By: racerx

Re: MSD coil restistant - 10/11/19 01:20 AM

Yes sir......Cab if you can check the primary side and the secondary if you can for me Thaxs. I have one of the Mallory coils here that check 12.5 on the secondary and .3 on the primary. Can't seem to get a reading (resistance) on those secondary side of there pro coils .
Posted By: Cab_Burge

Re: MSD coil restistant - 10/11/19 01:31 AM

How are you measuring the coil resistance so I do it the same way? work
Posted By: racerx

Re: MSD coil restistant - 10/11/19 02:21 AM

Muti-meter …...measured in ohms 200 in primary,20k in secondary. I can get a measure in the primary but not in the secondary try to check and see if a coil is bad.....Thaxs.

https://www.holley.com/products/ignition/ignition_coils/race/parts/8201
Posted By: Cab_Burge

Re: MSD coil restistant - 10/11/19 05:29 AM

Are you measuring across the + to the - post on the coil or measuring from + to the coil output, post and from the - to the coil output post ?
Posted By: racerx

Re: MSD coil restistant - 10/11/19 11:03 AM

Yes sir.....+ to - primary...….+ to coil out put secondary.
Posted By: Cab_Burge

Re: MSD coil restistant - 10/11/19 05:15 PM

I'm using a Fluke 87 meter and I got .820 K ohm from the - to the coil output, .819K from the + to the coil post and .3K (300 ohms)from the - to the+ posts at 32 degrees F in my car trailer.
Posted By: DoubleD

Re: MSD coil restistant - 10/11/19 06:12 PM

From MSD

The primary resistance is measured with the probes on the positive and the negative terminals of the coil. This value will vary between coils, but a rule of thumb on MSD’s coils would be between .03 - .7 ohms.

Secondary resistance is measured between the coil + terminal and the secondary tower (where the spark plug connects). This reading also will vary between the make of the coil, but it should be somewhere between 200 – 14,000 ohms! Quite a range. The important thing to look for is that there is not an open or a short in the windings.
Posted By: racerx

Re: MSD coil restistant - 10/11/19 09:15 PM

Thaxs…. Cab for the effort up That's what I got on the primary's .03 but I can't get a ohms reading on the secondary side of the coil, maybe it's a bad coil shruggy ……….Thaxs for the effort.
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