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Siwynne



Member Since: 04 Nov 2016
Location: West lancs
Posts: 605
England 
Strange gauge behaviours
Whilst driving to N Wales on Friday towing the biggest jet ski Yamaha make, four people two dogs and a load of kit the battery light flashed and the tacho and temp gauge stopped working for a second. Speed was reading as normal and fuel stayed the same. On the return journey with no ski the same happened but for about half a mile. No effect on performance at all and no eml or dtc logged but the tc light illuminated then went out on the next ignition cycle I had a Bluetooth obd reader plugged in monitoring oil and water temps and oil stayed below 110 and water no higher than 91 when pushing hard up long hills. Coolant has stayed where it should be and is at the correct level so the temperature gauge shooting up is not due to temperature.
Any thoughts would be appreciated
Post #1070567 29th Jun 2025 10:35pm
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Johan_B



Member Since: 20 Sep 2024
Location: Gothenburg
Posts: 112
Sweden 2007 Defender 110 Puma 2.4 CSW Tonga Green
Not exactly the same but sounds a bit related:

https://www.defender2.net/forum/topic96071.html
Post #1070582 30th Jun 2025 9:58am
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Siwynne



Member Since: 04 Nov 2016
Location: West lancs
Posts: 605
England 
I’m leaning towards the relay or a connection either under the seat or the dash cluster. It seems to come and go with shocks from the road. I’ll try the relay first due to ease of access.
Post #1070586 30th Jun 2025 12:15pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6680
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
Any power loss at all?

Sounds like not, so wouldn't be a relay.. would be looking at a CAN bus wiring issue between ECU and cluster.

However I wonder if your Bluetooth OBD reader being attached is a clue, perhaps knocking the CAN bus out for a short period?  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #1070590 30th Jun 2025 1:14pm
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Siwynne



Member Since: 04 Nov 2016
Location: West lancs
Posts: 605
England 
That has occurred to me and it did stop working once over the weekend.
Post #1070593 30th Jun 2025 1:33pm
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HardCharger



Member Since: 03 Mar 2013
Location: Manila
Posts: 773
Philippines 2011 Defender 110 Puma 2.4 SW Stornoway Grey
Is your battery clamped tightly? When this kind of happened to me (most symptoms present) it was found that even with the battery "tightly" clamped, the battery would shake when wiggling the wires to check for tightness, I wound up putting on a thin lead sleeve between the posts and the clamps and that resolved the problem for me. No Better Friend, No Worse Enemy
Post #1070613 1st Jul 2025 2:08am
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Siwynne



Member Since: 04 Nov 2016
Location: West lancs
Posts: 605
England 
First thing I checked but only a cursory wiggle I need to get the spanner’s out and check both clamps properly. Back to work and dad taxi yesterday so not had chance to look at much. I need to be methodical and check each of the suggestions made in turn otherwise I might fix it and not know how.
Post #1070615 1st Jul 2025 6:23am
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HardCharger



Member Since: 03 Mar 2013
Location: Manila
Posts: 773
Philippines 2011 Defender 110 Puma 2.4 SW Stornoway Grey
Mind you, my clamps were so tight that the whole battery would move when you shake the clamps. Still needed the sleeve to contact properly.

I would be driving then everything dies for a split second then move along like nothing happened except for some dash lights that would disappear after you start him up again. It was intermittent and no predicting when it would happen. After I added the sleeves, the issue went away and the truck ran much better. No Better Friend, No Worse Enemy
Post #1070654 2nd Jul 2025 1:53am
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Siwynne



Member Since: 04 Nov 2016
Location: West lancs
Posts: 605
England 
Did you loose power as the dash dipped out? I was able to continue driving as normal.
Post #1070655 2nd Jul 2025 6:11am
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HardCharger



Member Since: 03 Mar 2013
Location: Manila
Posts: 773
Philippines 2011 Defender 110 Puma 2.4 SW Stornoway Grey
It was a quick loss, like a blink. I was also able to drive normally while this was happening. It’s just alarming when it happens. You never know when that blink loss will be the last one before you’re stranded. No Better Friend, No Worse Enemy
Post #1070673 2nd Jul 2025 11:38am
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Siwynne



Member Since: 04 Nov 2016
Location: West lancs
Posts: 605
England 
This sounds like it could be my issue. I’ve tweeted the clamps but will sleeve them soon.
Post #1070701 2nd Jul 2025 6:13pm
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