[AT] Questionable ignition coil

[Mark Johnson]

In theory, you ought to be able to check the DC resistance on a coil to 
see if it is open or shorted...which won't tell you if you have a 
heat-related intermittent problem. [My gut says that intermittent breaks 
or shorts are probably the most common failure mode in a coil; hard 
failures result in an immediate failure to get spark!]

However, finding the baseline/correct values for a good coil might be a 
problem, especially for a coil from an antique.

Mark J

Columbia MO

On 11/5/2019 7:49 PM, Cecil Bearden wrote:
>
> That is my method of testing coils.  I usually take the distributor 
> out to install points and set them on the Sun Machine.  Probably 9 
> times out of 10, I end up rebuilding the distributor.  I quit buying 
> rebuilt distributors, they are just crap....  With Industrial engines, 
> there are not many rebuilders around...  This is where my lather and 
> mill pay off big time..
> Cecil
>
> On 11/5/2019 7:19 PM, Gilbert Schwartz wrote:
>> 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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