Posted by JMOR on September 26, 2009 at 07:37:01 from (72.181.156.161):
In Reply to: 6 or 12 volt coil ? posted by soybeanjoe on September 26, 2009 at 07:17:56:
Genos said: (quoted from post at 10:17:56 09/26/09) How can you tell the diff. from a 12 volt or a six volt coil thats not marked? what test do you do?
You can use just about any coil on a 12volt system IF you use the correct ballast resistor with it to establish proper current (about 4 amps stalled).
The 'true' 12volt coils , such as NAPA IC14SB (3.25 ohms), which require no ballast resistor can be identified by measuring their primary resistance with an ohm meter. They will measure between 3 & 4 ohms, where as the 6v coils will measure about one-half of that & in some cases even less.
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