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#1
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coil voltage
I've been running the Pertronix I on my 67 GTO for almost 20 years and recently decided to go back to points. Installed new points, condenser, and coil, purchased from our host. Gapped the points and set dwell at 30 degrees and all good actually starts up better. So out of curiosity I checked the volts at the coil (+ side to gnd) and I'm getting 11.8 volts instead of the 8 or so that i thought it should be. It does have the resistive wire. And I couldn't remember if i jumpered IGN 1 and IGN2 somewhere for the Petronix so I ran a bypass from IGN1 using a resistive wire from an old harness (same length about 4 1/2 ft) to the coil and I'm still getting 11.8 volts when car is running. Shouldn't the voltage be lower? What could I be missing? There is 14 volts at the battery. Thanks in advance for any suggestions!
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#2
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Assuming all the wiring is correct, with the key in the "on" position and the engine NOT running you should see battery voltage on the coil + (and on the coil -) when the points are open. The lower voltage (usually around 8 or 9 volts) will be seen on the coil + and zero volts on the coil - when the points are closed.
If the engine is running an analog voltmeter attached between coil + and ground will give an average of the 8 or 9 volts and the 13 or so volts that the alternator will be providing to the electrical system. If the engine is running a digital voltmeter attached between coil + and ground will typically bounce around all over the place.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. Last edited by Bill Hanlon; 09-06-2020 at 11:57 PM. |
#3
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Thanks for the detailed explanation Bill it would seem the problem was in my testing not the installation. All is good with low voltage reading about 7 volts. Was able to enjoy Labor Day without thinking something went wrong! Thanks again.
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#4
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You could always run an external resistor if in question or didn't have an OE resistive wire. The Mopar ones are very inexpensive and last a long time.
Sometimes the resistive wires over time become 'more' resistive. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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