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12 volt ballest resister

T

tom bleeker

Member
Ohms coil 2.7 + 1 ohm for ballast resister 3.7 divided buy
14.5 gives you 3.9 amps . This is to much it is supposed to
be 3.5 amps . Front distributor 12 volt onvertion i removed
ceramic ballast reisiter tractor would not start i still have
the resister on back of dash .
 
(quoted from post at 19:56:40 04/16/14) Ohms coil 2.7 + 1 ohm for ballast resister 3.7 divided buy
14.5 gives you 3.9 amps . This is to much it is supposed to
be 3.5 amps . Front distributor 12 volt onvertion i removed
ceramic ballast reisiter tractor would not start i still have
the resister on back of dash .
Click to expand...
here did the magic 3.5 come from?
 
(quoted from post at 20:23:59 04/16/14) Read in prior archives bruce explained how to check ohms on coil . Is 3.5 right or am i reading incorrectlye
Click to expand...
do not believe 3.5 or 14.5, or 1 Ohm are HARD numbers, so don't get hung up on fractions here....a little latitude is in order.
 
As JMOR said......

Close counts.

The target is less than 4 amps.

1 ohm for the OEM ballast resistor hot is "close enough". The spec is .3 cold to 1.7 hot, but at 1.7 ohms it would be red.

So, 1 ohm is a nice round number to use.

And, at that low resistance, you probably have meter error too.
75 Tips
 
Thanks bruce 4 is kinda the magic # and thanks for the education on calculating ohms law . Il probbly forget it but i can always go back in the archives to refresh my memory
 
I have to ditto what jmor said... Close counts, I've measured a bunch of 6 & 12v front coils, there was plenty of variation.

keep in mind this is a duty cycle setup, not steady state so much...
 
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