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Not knowing the system, here is my layman thinking:
-Offhand, the 10A blown fuse indicates too many amps(short to ground) somewhere close. Perhaps within the dash electronics or start/ignition circuit.
-But the tach/turn signals/etc. indicates backfeeding through the wrong circuit because of missing ground. It may have fried the radio already.
I'm assuming the main chassis ground is o.k., but it never hurt nothing to have too many grounds. An extra jumper cable or two can serve when checking.
When those 20-40K ignition volts try to get back to it's battery source, they will try and take any path available. Dead spark plug/wires may also be suspect and backfeed through the coil.
Can you pull every fuse(dash/radio/turns/etc) except the ignition and make it run good? If so, the problem will be in an accessory circuit.
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Meanwhile other things are still happening.
Last edited by john70t; 12-01-2011 at 08:20 PM..
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