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Old 07-11-2018, 10:43 AM   #1
GeneralBurrito
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Default Speedometer shuts off every now and then along with the odometer.

So almost every time I drive, the speedo needle would just drop to 0 and I noticed a few days ago that the odometer/trip meter weren't counting miles as well when the speedo drops. Would it have something to do with the L-plug that connects to the little circuit board behind the cluster or something power related? Every other cluster works perfectly except for the speedo. It would start working again sometimes by itself, with a small tap on the dash board, or sometimes with a few hard smacks. It's getting pretty annoying.
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Old 07-11-2018, 11:12 AM   #2
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Old 07-11-2018, 11:23 AM   #3
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Check the wiring at the differential housing too, sometimes they get rotten.
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Old 07-11-2018, 12:47 PM   #4
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The wires from the diff where they enter the body a prone to breaking.
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Old 07-11-2018, 12:52 PM   #5
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Diff wiring going south, bad/cold solder joints on the board, L shaped connectors getting loose, lots of things to start diagnosing for intermittent speedo operation.
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Old 07-11-2018, 08:12 PM   #6
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Originally Posted by Uncleknucklez View Post
Diff wiring going south, bad/cold solder joints on the board, L shaped connectors getting loose, lots of things to start diagnosing for intermittent speedo operation.
The solder looks pretty clean, my dad even inspected them up close and he though they were fine too. I checked the diff wire and the ones going into the plug we're stripped, I separated the wires so they don't touch and wrapped them up with e-tape. I think it could be the L shaped plug, I'll try adjusting the connectors for a tighter clamp in the circuit board and see how it goes tomorrow. That back plate shown in the link above has me interested too.
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Old 07-11-2018, 08:13 PM   #7
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One time use? So once it's removed, it can't be put back on?
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Old 07-11-2018, 08:18 PM   #8
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The tabs are designed to break when it's removed. If you're really careful, you may be able to unbend them enough to get it off without breaking them.
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Old 07-11-2018, 08:24 PM   #9
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The tabs are designed to break when it's removed. If you're really careful, you may be able to unbend them enough to get it off without breaking them.
That sucks, is that Volvo's way of preventing us from tampering with the cluster?
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Old 07-11-2018, 08:31 PM   #10
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Old 07-12-2018, 10:22 AM   #11
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I have NEVER seen one of these before. Is this not a 240 part?
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Old 07-12-2018, 01:23 PM   #12
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The late 240 speedometer is set up to accept the clip, so I imagine it's supposed to have it.

You've probably never come across a cluster that hasn't been removed before.
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Old 07-12-2018, 03:57 PM   #13
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Quote:
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The late 240 speedometer is set up to accept the clip, so I imagine it's supposed to have it.

You've probably never come across a cluster that hasn't been removed before.
http://imgur.com/gallery/uzPSN04
Does the clip screw into where the red arrows are?
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Old 07-12-2018, 04:06 PM   #14
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No, the tabs on the clip fit into the rectangular holes in the circuit board. It just snaps into place.

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Old 07-12-2018, 05:08 PM   #15
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No, the tabs on the clip fit into the rectangular holes in the circuit board. It just snaps into place.

Ah, I see now. Thanks for showing me.
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Old 07-14-2018, 04:34 PM   #16
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So I squeezed together each connection in the L shaped plug and it holds on to the circuit board tighter, I aslo secured the plug in place as much as I can with some electrical tape, but it still has intermittent power cuts. It seems to be somewhere in the dash because just a simple tap cuts the power, while I have to smack the crap out of the dash to get it going again. Could loose/finely cracked solder be the culprit?
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Old 07-14-2018, 04:40 PM   #17
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There's a flex fuse shown just to the left of the white speedo housing in the above picture. It supplies 12volts from the 3-pin connector to the speedo and console. Try removing and cleaning the connections carefully (I don't know how fragile they are after 20+ years).

Edit: See http://www.cleanflametrap.com/speedo5/ or http://www.cleanflametrap.com/speedoDiag.html

(Thanks Art!)

Last edited by bobxyz; 07-14-2018 at 04:53 PM..
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Old 07-14-2018, 05:24 PM   #18
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Okay I'll try doing that. What would be recommended to clean it, isopropyl alcohol?

Last edited by GeneralBurrito; 07-15-2018 at 08:34 AM..
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