Ignition system troubleshooting
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Try measuring the voltage across the battery terminals while the motor is running. It shouldn't be much past 14 volts (maybe 14.4 max or so). Frequent failure of replacement ignition modules is often a symptom of a charging system problem, because the module can burn out if the regulator lets the system voltage climb too high.
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New User
Joined: Jul 2009
Posts: 10
Likes: 0
From: Darrington WA
Charging system failure
That makes sense because I have been meaning to mention the fact that my battery has bubbled over. So it won't start to do that test but I would guess that since the battery is doing that I would assume you are right. Oh and the guy who did my exhaust said something about the ignition mod being hot. So my question would be what is my next test?
Thanks
Evan
'75 F100 390 4x4
Thanks
Evan
'75 F100 390 4x4
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