You should be able to draw a spark out to about 1/2", sometimes more, and it
should be blue and make a sharp 'crack'. Weak sparking can be caused by a
failed condenser, in which case it will barely jump 1/8", be yellow and make
a 'fizz' noise. If you remove the king lead from the coil you can safely
hold it in your fingers while you do this, but if you do it at a plug and
have a good spark you will probably yelp. You can also buy spark testers
(loads on Google) that do much the same thing i.e. have a variable gap or
several fixed ones. Carbon string leads do deteriorate over time (the
carbon seems to migrate and cause high-resistance spots) where over 30 years
I have found the silicone leads extrememly consistent. Does a 50s TD have
resistance leads or solid copper?
----- Original Message -----
From: <bamadio@statestreet.com>
To: <mgs@autox.team.net>
Sent: Wednesday, March 19, 2003 8:54 PM
Subject: Weak Spark
> I understand sooty spark plugs can be the result of a too rich fuel
mixture
> but I also believe it can be the result of a weak spark. How does one
> determine if the plugs are getting the proper voltage?
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