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Registered
Join Date: Aug 2005
Location: Monroe, LA
Posts: 112
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Speedometer not working
The speedometer in my 76 coupe stopped working shortly after I installed a 3.2 in it last year. I thought since it worked at least for a little time, it was just the speedo, so I swapped the one from my 82. Still not working, the odometer does not work either. Any ideas?
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76 911S 82 911SC Targa (Hot Rod In The Making) |
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08-08-2006, 02:42 PM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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I'm no electric guru, but I bet you're not getting a pulse to the speedo, which is electronic which also would affect the odo.
Can you put a scope or a meter on the signal wire and verify that you are getting pulses? (sorry about the electric guru thing...I couldn't resist   )
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08-08-2006, 02:46 PM
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Join Date: Aug 2004
Location: SoCal
Posts: 137
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something to check
in the middle of the two rear seat on the floor pan (under the carpet) there is a metal cover. remove this cover and see if the speedowire (brown) has been cut by rubbing againt the shift mechanism. I had this happen to me
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carrue529 1987 911 Carrera S.Wong chip|ElginCams|GT3 oil pump|short gearing|Guard TB-Diff|22/29 Hollow T-Bars|monobloc calipers|Bilstein HD/Sport|Turbo tie rods|Strut brace|CobraMonza II seats|7, 9 Fuchs|Elephant polybronze bearings F/R|Wevo eng mounts|bypass cat pipe|M&K muffler |
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08-08-2006, 02:50 PM
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Location: Monroe, LA
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Its OK, I'm an idiot on DC voltage...Would the signal come from the sensor from the transmission? I have voltage on the rest of the functional parts (the lights).
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76 911S 82 911SC Targa (Hot Rod In The Making) |
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08-08-2006, 02:54 PM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Start at the sensor or the speedo...and work to the other end. Since it occured after the swap, I would thing you did something to the wires...since it's the same tranny right?
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08-08-2006, 02:57 PM
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Join Date: Aug 2005
Location: Monroe, LA
Posts: 112
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Different trany, should the sensor push in or be line up in the hole a particular way. BTW, the wires at the shifter mechanism are good. I just checked them.
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08-08-2006, 03:29 PM
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Join Date: Feb 2005
Location: Mexico
Posts: 1,961
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Most probably you have aproblem with the sensor. You changed speedos and nothing happened.
According to the Bentley manual there is only one way that you can install the sensor. I think that the signal that you should get from this sensor is a square wave, 60 pulses per revolution. |
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08-08-2006, 05:08 PM
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Join Date: Aug 2005
Location: Monroe, LA
Posts: 112
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Does anyone have a pic or reference on how the sensor is installed?
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76 911S 82 911SC Targa (Hot Rod In The Making) |
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08-09-2006, 10:17 AM
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