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Saab Model 99 Bulletin Board
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Re: Tach wiring for 1977 GL
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Posted by Larry West [Email] (#1140) [Profile/Gallery] (more from Larry West) on Tue, 9 Oct 2012 10:40:48 Share Post by Email
In Reply to: Re: Tach wiring for 1977 GL, Stephen, Mon, 8 Oct 2012 19:42:24
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I seem to recall that while the tach lead in my 1976 WAS blue, it was a totally different color in my 1980. Do you have a wiring diagram? If you do, and you have a tach, I'm 90% sure they did NOT change the color of the other lead, so whatever is left is the tach lead.

Does your 1977 have the electronic ignition? If so, THAT is why the color of the lead changed! It's still blue to the coil, but since it is not the same lead to the tach, they changed the color. Points send 12v to the coil. Electronic ignition sends MORE than 12 volts, so you'd fry the tach if you used the same lead, and you always try to not re-use colors in a harness...

I would be extremely surprised if one of those leads isn't the tach lead. Both of my 99s were GL trim, and both had the wires.

I can't imagine pre-GM Saab changing that wire harness solely for the presence of a tach, between years or models. The cost of warehousing different harnesses for such a minor change would matter to pre-GM Saab, unlike GM Saab, where saving 20 cents on the production car made sense to someone, even though they'd have to spend hundreds of thousands to build and warehouse different harnesses because of a difference with one or two options...
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Current:
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Past:
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1990 900 5-speed
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1980 99 GLi
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1976 99 GL
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