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Old 09-04-2006, 05:19 PM
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12v Ignition Power

I am wiring a tachometer up for my 71 nova. The tach is an autometer 5" monster tach w/ external shift light 0-8000rpm. I have found the wires for the lighting wire, ground wire, and know where to hook up the tach wire to the tach terminal of the HEI. I am, however, having problems in finding a 12v ignition power source. I am not the best at the electrical system of a car but I think I have somewhat of a basic understanding. I want to wire this thing up asap, but I don't want to just start stripping wires mid-way to see if they are ignition powered or not (pretty messy and it looks terrible seeing a wire covered in electrical tape). I thought about splicing it into a hot wire right after the ignition switch, but I do not know where the ignition switch is located physically in the car. I do know it is somewhere down on the outside of the steering column (I think). Any suggestions or instructions I would greatly appreciate. I have both a test light and a voltmeter to check for power. I plan on sodering the connections. In the future I plan on upgrading the electrical system through painless or american autowire (don't know if that information is important or not).

Regards,
Dennis

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Old 09-04-2006, 05:38 PM
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Doc here,

Find the switched power to your radio, and Install your Tach power there..

You may have to bump the fuse value up a bit If it blows..say, if it is a 5, go to a 7 1/2...Just be sure it's the switched, not the memory preset, which is hot all the time.

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Old 09-04-2006, 06:10 PM
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The car doesn't have a radio currently and I have no clue which wire is the one that is routed to the radio. I'm afraid that the wires that normally power the radio aren't in the area that the radio resides in if I had one.
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Old 09-04-2006, 06:17 PM
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Doc here,

Go Directly to the fuse box, There should be a "Tab" marked IGN you can insert a slide on terminal too..

If you don't have that, then go to the Coil wire power. if you have a non HEI, be sure your on the non~coil side of the ballast resistor, If you have HEI, than hook it Directly to the "BATT" wire via a proper fuse..

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Old 09-04-2006, 11:10 PM
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I'll try that doc thnx! It's dark out right now otherwise I'd be out there messing with it right now. I will check both out tomorrow after work. If I don't have the fusebox one Ill do the hei connection you mentioned and tie in the proper fuse the instructions suggest in series to the tach.
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Old 09-05-2006, 12:02 AM
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Quote:
Originally Posted by crusherdbuzz
I'll try that doc thnx! It's dark out right now otherwise I'd be out there messing with it right now. I will check both out tomorrow after work. If I don't have the fusebox one Ill do the hei connection you mentioned and tie in the proper fuse the instructions suggest in series to the tach.

Doc here,

, let me know how it turns out for you!

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Old 09-05-2006, 11:46 PM
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I looked at the fusebox and found the IGN tab. It was quite faded so I just overlooked it and never payed any attention to those terminals. Thanks for the help. Now I just got to find the time to hook it up. That will probably be Sunday

I appreciate the help as always,
Dennis
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