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Index > Engine/Drivetrain > Thread: Ignition/Tach question
Thread: Ignition/Tach question
mwpayne1


Redlining
Posts: 239
posted April 28, 2007 06:29 PM

Ignition/Tach question

Trying to troubleshoot my non-working tach. It worked before I did the electronic conversion. I have the yellow/green wire hooked to the + of the leading coil, like wiring diagram indicates. Is there any way to test the tach?
I was thinking about buying another cheapo tach and rigging it up the same way, just to see what happens.
I've pulled the gauge cluster part-way out (steering column prevents complete pullout), looks like theres a solid green wire, yellow, and black wire going into the gauge itself.
Any ideas? Not a biggie, but I'm just the kind of guy that likes to have everything working.

       
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dhood


Hauling
Posts: 134
posted April 28, 2007 08:01 PM

My 77 uses a yellow/white wire for the tach and it is connected to the (-) terminal of the L coil. Signal is always on the switching side. One (+) wire from each coil goes to the respective ignitor on the dizzy.

       
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dhood


Hauling
Posts: 134
posted April 29, 2007 09:04 AM

Oh soorry, hope I didn't lead you astray. The Leading (+) is connected to the ignition and if you still have the smog hooked up, it is connected to the Trailing (+). Some people jumper the L&T together so both fire all the time. The (-) connections go to the ignitors. Gee I'm surprised nobody jumped me for this already.

       
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mwpayne1


Redlining
Posts: 239
posted April 29, 2007 01:05 PM
Edited By: mwpayne1 on 29 Apr 2007 13:05

Nope, you led me exactly where I needed to go. I unhooked the yellow/green wire from the '+' of the coil, attached it to the '-', tach works!

Geez..not the first time I've felt like a moron...

Anyhow, new pics if anyone is interested;
http://groups.msn.com/MazdaRotaryEnginePickup/repuproject.msnw?Page=Last

       
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tom93r1


Redlining
Posts: 458
posted April 30, 2007 01:41 PM

that truck is pretty, good job on it!
____________


'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!

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