Re: Flakey Tacho - Saab Sonett Bulletin Board - Saabnet.com
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Re: Flakey Tacho
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Posted by Stephen B (more from Stephen B) on Sun, 1 Nov 2015 00:36:54 Share Post by Email
In Reply to: Re: Flakey Tacho, friendofbear [Profile/Gallery] , Thu, 29 Oct 2015 13:17:39
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Greetings from Australia.
Well I fixed it! After a day and a half! Trouble is it could have only taken 10 minutes.
I followed your advice and redid the earths as this seemed possible as the cause.
No luck at all.
So I checked a few other things and finally dipecided yo take out the Alternator!
It's a rubbish job with the nose on right! Anyway got but out, but I stupidly damaged the shaft dismantling it! And it all seemed ok, could be the regulator.
So after reading here I could put a combined larger Alternator in. I went down to the wrecking yard today (Sunday) I had to pull 4 units off until I found the perfect one, a Mitsubishi Colt hatch from the 80s. I went home - it took 2 1/2 hours to get the right alternator. Swapped pulley and fan, and just had to drill the holes in the mounting bracket.
All done. Started her up, alternator was running at 14 volts - perfect, but charge light still on and taco still wonky
So I fitted new earths from dash, disconnected a few things like electric fan , all no good. In desperation, I decided to pull the alternator warning wire off the alternator to see if the tachometer stabilised. It did at Zero Tom! Nothing at all.
Then the penny dropped.I went inside and checked the wiring diagram, I wish I had a decent resolution one, and spotted the problem, yep you may have guessed it, the instrument feed fuse was blown! I replaced it and all is perfect. With the fuse blown, there were a load of back feeds making the charge light glow, and tachometer act odd.
Of course I should have picked it up as I realised later the charge and oil lights were not on before starting.

Anyway all fixed and I know have a 45 amp alternator that's in really good nick. The bearings in the old one were gettinold etc.

Thanks to all

posted by 119.40.105...

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