View Full Version : is it possible to test a coil and how?

06-08-2012, 7:42 PM
I have 2 old 6 volt coils and a harley accel style coil that i would like to test. does anyone know how to test a coil with out just wiring them.

06-08-2012, 8:30 PM
I snagged this off of a different sight when I was having trouble with my modern Bonnie.
Not sure if the Ohms would be much different, but it'll give you an idea I imagine.
<a href="http://s1120.photobucket.com/albums/l494/triumphray/?action=view&amp;current=COIL.jpg" target="_blank"><img src="http://i1120.photobucket.com/albums/l494/triumphray/COIL.jpg" border="0" alt="Photobucket"></a>

06-08-2012, 10:09 PM
a red neck way of testing them is to put a plug wire and spark plug on it, then put 12 volts + lead to one terminal and and take a negative lead and scratch it to the other terminal. (you really need a grounded condenser on the negative lead to make it work right )
every time you scratch it it should fire the plug with a big fat blue spark on the spark plug.

06-09-2012, 3:35 PM
Torch's way works great . The other thing to do is let it sit in the sun for a bit before you test it because most coils fail when hot not when cold .
The ohm's will be primary wire to primary wire .5-2.0 ohm and primary wire to secondary wire 8-10 K ohms .

06-09-2012, 5:27 PM
the accel harley style coils seems to be good. i think the dual 6 v coils work also. i think im going to run the harley style, i can conceal it alittle better

06-09-2012, 6:06 PM
So, they read in the same ballpark as a 12v newer coil. Thats good to know.

06-09-2012, 6:57 PM
are there disadvantages to running 2 6 v coils in series, rather than one 12 v dual coil or 2 12v coils in parallel

06-09-2012, 7:22 PM
There is no advantage to it, assuming you are talking about on an electronic ignition,
two 6vt coils wired in series is the correct resistance for a 12 volt electronic ignition,
....or.. a single dual lead 12 volt coil is correct,
but most times two 12 volt single lead coils wired in series makes for a weak spark that won't fire a rich mixture well.

On a 12 volt points bike, it will burn up two 6 volt coils in a parallel wiring set up, but is correct for two 12 volts.

( do a google search on what is series and what is parallel wiring.)

06-09-2012, 8:18 PM
thanks torch, i understand series and parallel its my job to im a union electrician,i just wondered if the 6v coils where comparable to 12v's or if i should just toss them. on my 71 i run points with 2 12v coils, i tried to run it with out a battery with a sparx capacitor but it was a pain to start so i just added a 12v batt and its alot better but im going to try the pazon elec ign on the 70 that im building now

06-09-2012, 8:32 PM
I'm with you.
I was I.B.E.W. local 11 for over 20 years,

06-09-2012, 9:15 PM
awesome im in ibew local 226 topeka ks