speedometer problems
Thread Starter
Instructor
Joined: Dec 2004
Posts: 198
Likes: 0
From: Newmarket Ontario
speedometer problems
Up until today my speedometer on my 79 has been working perfect. Today it died with no warning. Before I pull out the cluster and replace the cables ect. ect. ect.-----------is there something maybe simple I should be looking at first? Your input would be appreciated.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
This is how to check it on a 71 without cruise. Loosen cable from trans... give the inner drive cable a gentle but firm tug ... see if you can pull it out ... if you can it's probably broken ... because you should be able to pull it out ONLY from speedo end. If it don't come out with a tug, then chuck it up & spin it with a drill motor ... speedo should register ... if it don't then speedo has a problem ... OR ... maybe it's simply the cable has popped loose from back of speedo ... happens if someone has had a hand up in there fishing around. If you have cruise then it's abit more to it ... also check the gear in trans. I just lubed my 71's speedo & mech tach cables w/ moly lube ... my tach needle was jumpy ... disconnect outers at back of gages ... inner cables slide out the top ... aggravating, tight squeeze ... but now both gages smooth-as-silk.
Instructor
Joined: Jan 2000
Posts: 138
Likes: 0
From: Fairfax Ca
Speedometer problems
I too have a problem with my speedometer. It quit, as did the odometer. I know the cruise is shot and fallen apart, but can that stop the speedo? I checked the cables at the tranny and at the engine going into the dash, and they are connected, but I didnt' remove them so I guess something could be broken. Any ideas? I live in California and the closest speedometer repair place is 60 miles away.
Denyce C
77 Vette
Oil Aris
Denyce C
77 Vette
Oil Aris
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Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
the cable goes to a transducer, i would think that if the transducers bad you would have to bypass it, im guessing, i dont have cruse in a 73 and the car that i do doesnt have a speedo cable it has a generator on the trans that sends a/c current to the dash where there is a rectifier that converts it to d/c at the speedo,the faster the more the needle moves, someone who has that set up would have to chime in ..is there a way to take the cables off the transducer and go directly from the trans to the speedo by connecting the 2 - 1/2 cables toughter????
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
you can take the transducer a part take out the spring that is bound up inside .make shure that the gears now turn freely .put it back together .your cruise will not work but your speedo will . matt 1980 check your cable ends,they could be rounded off .
Heel & Toe
Joined: May 2005
Posts: 21
Likes: 0
Same thing happened to me. Bought a rebuilt transducer put it all together and no speedo. Turnned out to be the cable from trans has a nylon end on it. It was sharpened like a pencil and would not turn transducer.Check cable on transducer end. Wish someone would post a picture of what cable end looks like. May be able to form one with JB Weld. until I get one ordered. TIA............
Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
Originally Posted by ChevyL82
Same thing happened to me. Bought a rebuilt transducer put it all together and no speedo. Turnned out to be the cable from trans has a nylon end on it. It was sharpened like a pencil and would not turn transducer.Check cable on transducer end. Wish someone would post a picture of what cable end looks like. May be able to form one with JB Weld. until I get one ordered. TIA............
Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
Originally Posted by ChevyL82
Same thing happened to me. Bought a rebuilt transducer put it all together and no speedo. Turnned out to be the cable from trans has a nylon end on it. It was sharpened like a pencil and would not turn transducer.Check cable on transducer end. Wish someone would post a picture of what cable end looks like. May be able to form one with JB Weld. until I get one ordered. TIA............
