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1)After a crash course in the multimeter, the unilite module is smoked. Used their testing procedure from their website, and there is no voltage drop when the module is blocked. It's reading a full 12 volts off the negative side with the optical window blocked. Should be 2v... So, I'll get a new module ordered post haste..
Yes, exactly as i suspected. These units will not tolerate 12V being attached to the signal input at all, it would not suprise me if you have not fried the tachometer as well.
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2) The yellow fused wire in the photo is the power supply for the fuel pump. No power coming through it. Unplug it with the key on, and the fuel pump goes silent. Is this a good place to have the fuel pump powered from?
I figured that. The fuel pump has a lot of load to be piggy backed off the ignition coil, I always run a relay to the fuel pump and feed it straight from the battery, you can use the 12V input from the coil that you have existing currently to "latch" the relay without issue. Relays remove load from the system and power the component with battery power directly. When I saw that fused yellow wire attached to the same lead as the green mallory wire I knew you made a huge boo boo.
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3) The two black wires twisted together running to the same side of the coil as the yellow wire are the key-on hot wire for the coil. Good 12v with the key on...
Those are the ones that provided the power to kill the Uni-Lite module.
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4) How do I verify that the lone black wire on the back side of the coil is the tach wire? No voltage coming through it...
Because it's black with a purple (violet) stripe on it-
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5) Last, and most importantly, am I correct in my assumption from Jake's post that it does not matter which side of the coil you use for positive or negative as long as all of the positive wires are grouped together on one side(key on 12v/fuel pump/mallory red), and the negative (tach wire and mallory green) are on the other?
I have ran cars for years with the coil leads attached to the opposite poles of the coil without issue- some coils don't even have the terminals noted as + or -. If your coil hadn't been marked you would have been forced to think a bit harder and this issue would not have occured. As long as all the correct wires are connected to each terminal the engine will still function, but as soon as you connect a signal wire to 12V things will smoke.
This even happens with a point type system, I last made that mistake when I was about 10 years old.
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I really don't want to burn up another Benjamin on a Unilite module... I'd be better off taking up a cheap habit like Cocaine...
If this unit was originally purchased through my store I will absorb the cost of the replacement module, just send it back to me with proof of purchase and we'll take care of it.
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Thanks again for the input!!!!
No problem.