Posted by John T on April 11, 2009 at 09:44:44 from (66.244.97.31):
In Reply to: Coil Question posted by Dunndan on April 11, 2009 at 09:14:33:
Welllllllllll its kinda hard to say just how hot that hot is over the net butttttttt that being said I wouldnt expect (given correct full true 12 volt coil or a properly ballasted 6 volt coil) a coil to get so hot it would raise a blister !!!!!!!!
Sure, if the ignition is left on a long period with the tractor not running and the points are closed a coil (even a correct one) will get pretty hot but NOT in just a minute or so
1) I would insure what youre calling call a 12 volt "internal ballasted" coil is indeed a full true 12 volt coil. If so, its internal primary resistance as measured between its lil + and - terminals will be in the 2.5 to over 3 ohms or so range BUTTTTTTT if its only like 1.25 to under 2 ohms, ITS A 6 VOLT COIL AND REQUIRES AN EXTERNAL VOLTAGE DROPPING (12 to 6) Ballast Resistor otherwise it will overheat
NOTE a full true 12 volt coil (no ballast required) may be labeled "12 volts" or "12 volts NOT for use with external ballast resistor" HOWEVER if its labeled "12 volts for use with (or requires) external ballast resistor" IT INDEED NEEDS ONE OR IT WILL OVERHEAT
If the coils output (to distributor) is constantly shorted out by a short in the distributor (where wiring terminal passes through),,,,,,,,,or the condensors a dead short,,,,,,,,or theres a wiring short,,,,,,, or the points are shorted or never opening, the coil will get pretty hot PLUS theres no spark. You may wanna insure that BEFORE you buy a new coil.
If you place a 6/12 test lamp on the coils output (to distributor) terminal with ign on and slowly crank the tractor, it MUST be flashing ON (points open) and OFF (points closed) If it never turns on theres a short like the condensor or wiring or points not opening or teh distributor input pass thru terminal is shorted to case (check that) assumign the coils primary is continuous. Check for wiring shorts and a condensor short and the distributor and insure points are openign n closing n gapped before you buy a coil.
No fire till the test lamp flashes on n off as engine rotates and points break open n closed and THERES NO SHORTS. PLUS a continuous short will heat the coil
If you want my troubleshooting procedure post back
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