Re: !2 Volt Coil Debacle

Posted by Phil (AZ) on October 30, 2001 at 14:28:49 from (216.222.116.16):

In Reply to: !2 Volt Coil Debacle posted by Zed-MD on October 29, 2001 at 16:19:42:

SAM,
When I got my 9n it also had an external Coil that worked well, but it was mounted under the leaking gas tank. I replaced it with the correct Coil and have the old one as a spare.( have 4+ years on OEM points & Coil )

The dist itself is not modified and should be serviced per manual. The Small wire, from the external coil, connects to/under the Concave Screw in the Dist.

The Hi-Voltage wire (large), from the external Coil, connects to the Old “Coil" Contact spring (soldered) this contacts the Dist Cap when the coil is installed.

The other Small wire, on the External Coil, will be connected to the electrical Terminal Block Upper Right (ballast in line) or upper Left (ballast bypassed).

Testing an external Coil with meter: Connect the meter across the external Coil small wire terminals ( one probe on +/ bat and other probe on -/ dist) When the points are “Closed” the voltage reading will be ~ 12 V (ballast bypassed) or ~ 8 V (ballast in line). When the points are OPEN the voltage will be 0 (zero) . (Bump the starter to open and close Points) The Open condition is “Very” important (zero) and valid.
The Points Closed measurement can be ~ 12 V even with an “open” bad Coil ... so you need to make sure current is flowing in the coil. This can be done by simply looking at the ammeter on the dash (> 2a OK), or adding(just for testing) a resister (ballast) in line and measuring across the Ballast ( 2-3 v OK) , or a test light connected to the -/dist coil connector (with points open) the lamp should light.

Hope this helps,

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