Re: How long will a coil last without a resister?

Posted by mj on January 03, 2003 at 14:41:05 from (216.52.32.190):

In Reply to: How long will a coil last without a resister? posted by Garry on January 02, 2003 at 10:01:25:

I hooked up a "12v" coil once to a stock 12v
VW system WITH THE RESISTOR REMOVED
and it lasted about 30 seconds after I turned
the key on; guess the points were closed. I
had assumed that since it was a 12v coil that I
didn't need the resistor.....WRONG! Somehow
the manufacturers' label had been placed over
the "12volts...Use with external resistor"
stamped on the coils' case. As has been
pointed out, there ARE coils with the resistor
built in, just make sure which kind you have.
On 12v systems that used a resistor (pretty
much all automotive stuff since the change to
12v from 6v was made during the '50s) the coil
ran off of the 'start' post of the ignition switch
when starting which bypassed the resistor
and supplied 12v to the coil FOR STARTING
ONLY. When the ign. key was released the
switch returned to 'on' and the coil received 6v
from the resistor which is wired to the 'on' post
of the switch. This setup allowed maximum
sprark for starting but returned to 6v for
running. I commonly retain the stock 6v coil on
tractors that I convert from 6 to 12 volts, I just
run a resistor in the line and forget about the
12v start feature most of the time.

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