Karl,
I've never measured the input voltage to the coil, but it sounds like what I
would expect. The battery voltage (around 14 volts when running) going to
the ballast resistor is reduced by about half as in comes out and goes into
the coil positive terminal. As the points close, they draw down the voltage
a little more and then when the points open, it springs back up.
IMHO The factory ignition coils were marginal at best when new. The best
improvement you can do to these older engines is to use a modern high output
ignition coil. You will get up to 4 times the starting spark. I use a Jacobs
coil on my Dodge. Unfortunately it is chromed. Pertronix also sells a high
output coil in OEM black. You will have to ask them about what ballast
resistor to use with points.
Dave Homstad
56 Dodge D500
-----Original Message-----
From: Forward Look Mopar Discussion List
[mailto:L-FORWARDLOOK@xxxxxxxxxxxxx]On Behalf Of Tuff Shift
Sent: Thursday, April 11, 2002 3:43 PM
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: [FWDLK] Coil voltage
Has anyone ever measured the output voltage of the coil from the pos term to
ground while the engine was running?
I suspect I may have a weak coil on my 61 300G and when I checked that
particular terminal to ground, I only get 8 vdc and it rythmically pulsates
1/2v up and down on either side of the 8vdc.
When I check across both terminals of the coil, I get 6vdc. Does this sound
right to any of you? How is the coil supposed to be checked anyway?
Karl
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