speedometer fixing
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New User
Joined: Aug 2006
Posts: 16
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From: utah
speedometer fixing
My speedometer has quit working on my truck. do these trucks have mech. cables or are they electric. also my fuel guage doesnt seam to read correctly. after fill up it says 1/2 on the front tank and 3/4 on the rear tank. thanks in advance for any help.
Senior User
Joined: Jul 2006
Posts: 207
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From: Sandy Lake, MB
The speedo is run off a cable. The cable runs down to your transfer case and connect to a speed sensor. Either the speed sensor is no good or you have some severd wires for the speed sensor circuit. As for your fuel gage, im not to sure but my best bet is that the fuel pickups in your tanks are on the fritz.
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
The cable is all there is on an 86, if that's the one you are asking about, no speed sensor, as there is no need for one, being 4 speed, there is no computer to give the info to, so it doesn't have a sensor. The cable may have broken, or the plastic gear in the t-case stripped.
A common problem these senders have is the float filling with fuel. A tiny little pinhole forms where the arm hold the brass float, and the slowly fill up. That would be the guess I would have for why they read, but not up to snuff. Usually, when the sender fails, it reads empty only, or full only. If you get an open spot on the resistor, then it goes to full.
A common problem these senders have is the float filling with fuel. A tiny little pinhole forms where the arm hold the brass float, and the slowly fill up. That would be the guess I would have for why they read, but not up to snuff. Usually, when the sender fails, it reads empty only, or full only. If you get an open spot on the resistor, then it goes to full.
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New User
Joined: Aug 2006
Posts: 16
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From: utah
i looked at it today, the cable is there so i am assuming that it is the gear in the t-case. how hard is it to fix that gear. i have built many a t-case before but they have all ben simple t-case's. FTE rules! thank you guys for all your help.
Hotshot
Joined: Feb 2004
Posts: 11,697
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From: Marengo, Iowa
The cable will often break half way up, so simple visual inspection is not enough. The way to test it is too kook a drill the the end of the cable and see if the speedo mves. Also, the gear inside the t-case may not be the issue, rather the one that goes in with the speedo cable, so you don't have to tear the t-case down, just the gear that you take out. My bet is actually on the cable though. Most times the cable has snapped. It just rarely does it at the end.
Elder User
Joined: Mar 2002
Posts: 529
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From: France
The hard part is not at the transfer case end, just one tiny bolt,its getting behind the dash....a real pain, if you have big hands you will need to borrow your girlfiends hand to pull the cable head out of the instrument panel!!!
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