06-30-2017, 04:27 PM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,852
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Not Ranked
Ignition / Electrical Gremlins
Environment: - MSD 8477 distributor
- MSD 6A analog ignition control box p/n 6200
- MSD Blaster 2 coil (mounted vertically)
- Optima Yellow Top battery in trunk - unknown vintage (I've had car 3 years, and it was in it when I bought the car)
Scenario: - Car running fine no problems.
- Shut car off, came back 10 minutes later and there was barely a click from the starter when I turned the key. Voltmeter showed 11 volts (14+ when engine running).
- Had recently been having some hot start issues that seemed to be getting worse, so thought perhaps battery was failing. Replaced battery and got a small spark when hooking up ground - that tells me something was drawing power.
- A few key turns with weak 'clicks' from starter, but then starter engaged and engine turned over like crazy - but it wouldn't fire. There's fuel, but no spark.
- Coil was wet on top, appeared to be oil. Touched coil and it was so hot I almost burned myself. Removed + / - wires and checked battery again - no spark. Coil was hot electrically and thermally, even with ignition off.
- Noticed gauges (e.g. voltmeter, electric coolant and oil temperature) were no longer working. Switched 12V electric accessory outlet also dead. Hmmmm
- Replaced coil with new coil, heard a 'pop' from MSD box when + /- wires to coil touched each other (not a good sound, suspect I now have problems with MSD 6a - but that's secondary). No longer any current draw on coil with ignition off.
- Still lots of cranking, but no spark.
- Have checked all the fuses I could find, none of them have blown.
Questions: - One suggestion I got was to look at the ignition switch - could this have failed, leaving ignition on and coil energized, while at the same time not providing current to gauges and accessory outlet?
- Could MSD 6A box fail in such a way as to cause coil to remain hot with ignition off?
- Other suggestions?
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Brian
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