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Pontiac Forum: No voltage to the ignition coil '65 Bonneville
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Old October 25th, 2017, 03:24 PM
BillyJack BillyJack is offline
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No voltage to the ignition coil '65 Bonneville

Hello,
I have a '65 Bonneville convertible which I purchased a few weeks ago. The car will NOT start. When I turn the ignition key, the engine cranks but there is no voltage to the positive terminal on the ignition coil and there is no spark at the plugs.
The wiring diagram shows one wire (BLACK-PINK) running from the (+) terminal on the ignition coil to a plug/terminal strip (the plug/terminal strip is located on the firewall in the engine bay). From the plug/terminal strip, the diagram shows two wires on the other side (YELLOW and WHT-ORG-PPL) inside the car going to the ignition switch. The WHT-ORG-PPL wire is identified on the wiring diagram as "RESISTANCE WIRE".
I'm thinking that there is either a problem with the BLACK-PINK wire or the WHT-ORG-PPL REISISTANCE WIRE. I put an ohmmeter from the (+) terminal of the coil to the other end of the BLACK-PINK wire and actually got an ohm reading of 4 to 6 omhs approximately if I recall correctly. I expected to see either a "0" or "1" on the digital ohmmeter/multimeter.
Do resistance wires burn out? I figure the purpose of the resistance wire is to reduce the voltage below 12 volts to the (+) terminal on the coil to prevent from frying the points. Any help would be appreciated. Thanks, BillyJack
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Old October 25th, 2017, 04:00 PM
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melsg5 melsg5 is online now
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disconnect the clip from the positive coil, it should have two wires.
place the voltage gauge on the windshield so you can see it from inside the car and connect the red to the wire clip and the black to a good ground
turn the ignition key to the run position, you should get a couple of volts below battery, maybe 9 volts.
crank the engine and you should get full battery voltage 12+
the wire for full battery comes from the starter solenoid
the wire, resistance, comes from the switch.
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Old November 3rd, 2017, 07:44 AM
BillyJack BillyJack is offline
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Quote:
Originally Posted by melsg5 View Post
disconnect the clip from the positive coil, it should have two wires.
place the voltage gauge on the windshield so you can see it from inside the car and connect the red to the wire clip and the black to a good ground
turn the ignition key to the run position, you should get a couple of volts below battery, maybe 9 volts.
crank the engine and you should get full battery voltage 12+
the wire for full battery comes from the starter solenoid
the wire, resistance, comes from the switch.
Thanks for the advice. Sorry for the tardy reply. I hope to be working on the Bonneville again this weekend. I will re-check voltage to the positive wire on the ignition coil again.

Last week I checked the wiring from the switch to the coil and it passed the ohm meter continuity test (i.e. the wires are not broken). I also pulled the ignition switch and tested it and it appears to be in order. I must be close, and hopefully I'll get it to fire on Saturday!
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Old November 3rd, 2017, 09:43 AM
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OK, let us know the results of the two voltage tests.
Do you own a dwell meter and if so have you checked the dwell while cranking?
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