[AT] Questionable ignition coil

[deanvp at att.net]

Yes, DC resistance tests can be run on the coils but that might only rule out the obviously bad ones.  The problem we have as shade tree mechanics we typically don’t have adequate test tools. A coil is one that requires specialty high voltage test equipment when not mounted on a running engine. A lot of coil failures are due to high voltage break down and may  only occur at higher temperatures or even intermittently. Testing for that without the specialty tools is next to impossible except for actual installation and various environmental test.  DC tests will discard the most obvious but trying them on a running tractor may be the only good test. And that may miss those that fail under extreme conditions.

 

Dean VP

Snohomish, WA 98290

 

From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Gilbert Schwartz
Sent: Tuesday, November 5, 2019 5:20 PM
To: at at lists.antique-tractor.com
Subject: [AT] Questionable ignition coil

 

I would like to try and delve into the wide knowledge and expertise of the members within ATIS. 
Is there any acceptable method of determining if an ignition coil is good short of installing it on a running engine. Our 1949 AC G would not start a few days ago after being parked for a short period of time. A quick observation determined the contact points were beyond use. I went to the local auto parts store and was advised I probably should replace both the points and of the condenser because they felt like that condenser went first and it caused the points to burn up. With this information I also purchased a new coil even though I wondered if the coil was a bad. 

Bottom line; Is there any way to bench test a coil? We have several used coils laying around here of questionable viability. I would like to pitch them if they aren't any good. 
I appreciate anything you can tell me. 

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