Re: No voltage at coil

Posted by lee on August 01, 2004 at 20:08:08 from (24.24.95.246):

In Reply to: Re: No voltage at coil posted by Terry on August 01, 2004 at 18:24:12:

6 or 12 volt coil? Resistor in the circuit anywhere? Fused anywhere between bat and switch and coil? Just a little mysterious to me not being there that you do not have 12 volts at coil + with the points open. I am thinking there is something wrong in the feed circuit to the coil but it seems you would still have 12 volts with points open. Suggests maybe also a shorted coil or capacitor. You will have 12 volts at coil positive all the time points open or closed when all this is resolved. Leave it at that for now. Back to what you wrote above. It sounds like you have 12 volts open circuit voltage (+ wire disconnected from coil) measuring from + coil wire to ground but maybe a poor connection or bad switch so when you measure open circuit you get 12 volts but when you connect and put a current (coil) load on it it fails to pass the current. If you hot wire direct from bat + to coil + everything else assumed good it should start. I would just touch this hot wire to coil momentarily to test for excessive current (excessive sparks) draw suggesting a shorted coil or condensor. Test it points open and closed. Don't touch the metal terminals or wires or coil, you may get a slight shock.
Stay clear of the coil secondary or disconnect
at the coil. If there is a resistor in the coil feed circuit somewhere don't run too long with a direct hot wire. Do you have a 6 volt coil? Jump around the switch terminals to test the switch.
If you jump around the switch and it start it's the switch. Check the wiring from bat to switch to coil if switch jumper does not help. If a resistor is in series with coil (between switch and coil) somewhere it may be defective. If a fuse is in there somewhere it may be defective or poor connection.

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