Re: Ignition

Posted by John T on January 14, 2007 at 08:26:09 from (66.244.90.5):

In Reply to: Ignition posted by Scott Eugene on January 14, 2007 at 05:36:27:

Scott, Its quite possible the coil may have overheated and its primary winding (between its lil + and - terminals) became an open circuit !!!!!!!!!!!! Other possibilities may be a bad ignition switch or points but if the switch was on and the points closed (as they normally are) even though they drew current all that time they werent opening n closing which is a cause of arcing n burning, so Id suspect the coil got hot n opened up first.

Theres a couple ways of checking for that, one is to remove all its leads and use an ohmmeter to measure its primary resistance between its lil + and - terminals, and it should be like 1.5 ohms for a 6 volt coil but around 3 ohms if a 12 volt. If its an open circuit, its obviously baddddddddddd.

The other is to take a simple 6/12 volt indicator test lamp with its alligator clamp wire to frame ground and its probe terminal on the coils low (to distributor) terminal. Turn the switch on and when the points are open (could place a match cover between to hold open n insulate or manually/insulated open them) if the coils primary is okay and continuous, the lamp should glow BUTTTTTT if thay are allowed to close and ifffffffffffff they and all the wirign is good n correct, the lamp should go off as that point is effectively grounded. With the points open the lamp should glow UNLESS the coils primary has burned open........

As the engine is cranked over the test lamp on the coils low (to distributor) terminal should flash on (when points are open) but off (when points are closed)

Of course, shes never gonna spark unless theres also hot voltage over on the coils other high (from switch) terminal. Put the lamp there and turn on the ignition and if the lamp dont glow check n trace backwards up to n including the ignitiion switch (in case its bad) and then voltage getting to the switches BAT input terminal. You could also just try n hot wire the coil by temporarily jumping hot battery voltage to its input n see if she fires then.

CHECK THE COILS PRIMARY,,,,,,,,,check the points for opening n closing and clean/buff/polish them if carboned up or gray oxide coated slightly but file or replace them if badly burned or pitted and reallyyyyyy black,,,,,,,,,,,,,check the ignition switch,,,,,,,,try the ohmmeter test or the test lamp method above for coils primary and/or points problems.

If that dont cure it post back and I will post my long winded Troubleshooting Procedure

Let us know, Best Wishes n God Bless

Ol John T and all

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