 | Home > Technical > TD5 or 50th Annivesary speedo question |
 
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| g-mack Member Since: 07 Jan 2014 Location: northumberland Posts: 1967  
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Post 2002 td5 (digi odo)take it from a transducer in the tranny box
Not sure bout 50th though My 109 thread my youtube channel |
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22nd Jan 2015 3:47pm |
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| Go Beyond Member Since: 30 Jan 2012 Location: Headcorn, Kent Posts: 6678
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The 50th Speedo is not the same as the TD5, it is unique to the 50th
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22nd Jan 2015 4:39pm |
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| Culminator Member Since: 30 Apr 2013 Location: West sussex Posts: 305 |
OK great, it's unique then, thanks for clarifying. Before I take it out and send it away, I want to be sure that the problem is not to do with the electrical feed or sensor pick up that moves the needle. When I switch the ignition on, the needle twitches, so it's getting an ititial feed and i'm thinking the actual guage may therefore be OK and that's it's more to do with a pick up sensor. I think I heard somewhere that they have a sensor near the rear wheel????
Thanks again! |
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22nd Jan 2015 4:51pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6641 
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I think the speedo sensor is the same as a Td5 though, YBE100530.
The Td5 one is a development of the 50th/NAS one.  1988 90 Td5 NAS soft top
2015 D90 XS SW |
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22nd Jan 2015 6:27pm |
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| Romadog Member Since: 07 Jul 2011 Location: Powys Posts: 1750 |
Martin is correct.
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22nd Jan 2015 6:36pm |
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| Culminator Member Since: 30 Apr 2013 Location: West sussex Posts: 305 |
So is the sensor located near the gearbox or near a rear wheel? Could a blown fuse cause a failure like this and does anyone have a fuse layout or wiring diagram?
Thanks! |
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22nd Jan 2015 10:17pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6641
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It's on the side of the transfer box behind the handbrake drum.
I have got a wiring diagram but not on my phone  1988 90 Td5 NAS soft top
2015 D90 XS SW |
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22nd Jan 2015 10:21pm |
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| g-mack Member Since: 07 Jan 2014 Location: northumberland Posts: 1967
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Don't think its fused on its own, 3 wires straight from transducer to speedo harness plug My 109 thread
my youtube channel Last edited by g-mack on 24th Jan 2015 1:57pm. Edited 1 time in total |
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22nd Jan 2015 10:41pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6641
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Fuse 18, but this would have also taken out the brake lights, reverse light and front wiper.
1988 90 Td5 NAS soft top
2015 D90 XS SW |
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22nd Jan 2015 10:42pm |
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| Culminator Member Since: 30 Apr 2013 Location: West sussex Posts: 305 |
That's fab guys. So, without further investigating as its too bloody cold, when I bought the car and test drove it, the speedo worked but when I picked it up, the front wiper didn't work and neither did the speedo. The fuse for the wiper has blown, I know that as I've already checked but not replaced it yet. I'd be very happy if this has also caused the speedo to stop working and wondered if they were connected in some way the other night.
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22nd Jan 2015 10:58pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6641
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If that is the case you don't have brake lights or reverse lights either, so change the fuse before you go out on the road
 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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22nd Jan 2015 11:03pm |
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| Culminator Member Since: 30 Apr 2013 Location: West sussex Posts: 305 |
Cheers Martin, I hadn't realised that but thankfully not driven it since I picked it up.
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22nd Jan 2015 11:15pm |
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| Culminator Member Since: 30 Apr 2013 Location: West sussex Posts: 305 |
So, my speedo failure was indeed down to a blown fuse!
So, if anyone else has a failed speedo on a 50th, check if your wipers have also failed and if they have, it's the blue 15 amp fuse that's gone. Thanks forum  |
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24th Jan 2015 1:09pm |
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| mk1collector Member Since: 17 Sep 2009 Location: West Yorkshire Posts: 6772  
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Check the wiper boxes and see if they need un seizing because if the motor is labouring that sometimes blows the fuse.
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24th Jan 2015 3:37pm |
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