resistor needed for coil 41 ford

P

peterb

Junior Member
Changed from original coil on flathead 41 to a 6 volt round style coil and using the change up top for the distributor coil area.
Should I install a restistor between the hot wire from the switch to the coil.
Not using the resistor that is original on the car as it is burned out.
 
The coil I purchased did not have any information on if it needs a restistor.
Just had printed info on package of 6 Volt Coil.
 
Most 12 volt coils use six volts to run with a resistor dropping the six volts.
Amd most six volt coils are actually a 12 volt coil, i would say run it paying attention to heat build up etc..
 
Here's the best advice:

"Always check the coils resistance !!" - Bubba, H.A.M.B. 06-23-2011, 06:09 PM

(Measure the resistance across the + and - poles of the coil with your ohmmeter.)
 
The can type coils that were used in the 8BA family of engines had the correct primary resistance to work with out a ballast resistor. The old plastic case type with the iron core had to use ballast. You will be OK with a can type made for 6-volt operation unless you switch to a 12-volt negative ground system as used after 1955.

The 8BA type coils all would have had 1.05 to 1.55 OHM primary winding resistance with 4100 OHM secondary winding resistance at 75 degrees F. They were designed to draw 3-amps running and 5-amps with engine stopped. The condenser is .2 to .25 micro farad capacity with these systems.

Kerby
 
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