Voltage drop...coil or distributor related

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   Hi guys,

A bit of an odd issue, not sure if its normal or not.

When the coil (MSD 8222, ballast is in place) is wired to the distributor (some EI conversion the owner did), key-on voltage at the coil, choke and ignition switch drops from 12.5V to 11V or so. Once the distributor connections are removed, voltage stays constant. If I loop in the red wire, everything is normal. The second I connect the black distributor wire to the (-) terminal on the coil and turn the key to the on position, voltage drops.

Is this normal? To me it implies resistance coming from the distributor. Could there be a short in the dizzy?

Any input or experience is appreciated.

Derek

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delovett Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: June-02-2012 Location: Burnaby Status: Offline Points: 67	Post Options Post Reply Quote delovett Report Post Thanks(0) Quote Reply Topic: Voltage drop...coil or distributor related Posted: June-01-2014 at 9:36pm
	Hi guys, A bit of an odd issue, not sure if its normal or not. When the coil (MSD 8222, ballast is in place) is wired to the distributor (some EI conversion the owner did), key-on voltage at the coil, choke and ignition switch drops from 12.5V to 11V or so. Once the distributor connections are removed, voltage stays constant. If I loop in the red wire, everything is normal. The second I connect the black distributor wire to the (-) terminal on the coil and turn the key to the on position, voltage drops. Is this normal? To me it implies resistance coming from the distributor. Could there be a short in the dizzy? Any input or experience is appreciated. Derek
	1973 Nautique 351

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: June-01-2014 at 9:49pm
	Derek, The voltage drop could be from the resistance of the coil from a internally resisted coil. Ohm out the distributor to check it's resistance. You do NOT have a short. A short is a direct shut to ground. Ohm out the contact in the ignition switch too. I have seen where the contacts get old and create resistance.
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

delovett Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: June-02-2012 Location: Burnaby Status: Offline Points: 67	Post Options Post Reply Quote delovett Report Post Thanks(0) Quote Reply Posted: June-03-2014 at 8:29pm
	Took some ohm readings today. Ignition switch is good. Secondary on the coil is 5.0 vs 4.7 spec from msd. Two interesting readings. For the primary at the coil, I can't get a consistent reading. The meter jumps all over the place, settles on 0 then jumps again. Bad coil? Ohming out the two distributor wires on the 2000 setting, I get a reading of 1200. Distributor issue?
	1973 Nautique 351

Voltage drop...coil or distributor related

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