Well if the nutter is an option for you, and it's something you want to do anyway, it may open up a few doors for you here. Problem is, doing more than one thing at once to get the idle back can confound the troubleshooting process, so it's easier to get in over your head if you're not careful. At some point though, the computer may have to be unplugged, at which time, you'll have to atleast temporarily bypass it to see if you can get the engine to idle so it can warm up and duplicate your short. What a pita... a short that only shows itself at NOT...
What do you mean when you say: if the "starter resistor" was not hooked on to coil? Do you mean the ignition resistive wire that runs to the ignition coil positive terminal? And if so, what do you mean it was not hooked up? You bypassed it with standard wire or you left it off altogether or what?
If you bypass the resistive wire the ignition module (and coil after a while) will likely cook. I lost 3 reman duraspark ignition modules experimenting without the resistive wire before I went with the TFI/HEI hybrid. One went the same day it was installed. But clarify that's what you mean to say before I waste too much of your time harping on that.
Again, how long does it take to pop the fuse? Kind of helps to determine the nature of the short. Immediately after the key is cycled to ON? Does the engine actually have to START for it pop? START and warm up? Things like that. Get yourself some spare fuses, you're likely gonna go through a few of them.
85 CJ7 / 258 / T176 / Dana 30/ AMC 20
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