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Instruments lights are not working #604173
19/11/19 05:15 PM
19/11/19 05:15 PM
Joined: Mar 2010
Posts: 380
Germany
4acker Offline OP
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4acker  Offline OP
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Joined: Mar 2010
Posts: 380
Germany
On my 2006 4/4 the Instruments lights are not working.All cables, the stalk switch and the dimmer are ok. Sometimes they are working for a short time but than suddenly everything is dark. Also the fuel gauge and the cooling water thermometer stop working. So it seems all three a connected but I don't know where to look. Could some one help?


2006 4/4 70th anniversary, 1985 VW 1200 50th anniversary, 1977 Vespa 50 Special, 2003 Vespa PX 200E
Re: Instruments lights are not working [Re: 4acker] #604176
19/11/19 05:29 PM
19/11/19 05:29 PM
Joined: May 2014
Posts: 2,721
Forest of Dean
SteveT Offline
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SteveT  Offline
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Joined: May 2014
Posts: 2,721
Forest of Dean
you could try and eliminate the dimmer by joining the wires up on it first?

although if the gauges go as well its more likely to be a feed issue.. check supply and its not unknown for a dodgy fuse the mess about.


Steve

110th +4 AM Chiltern Green
1939 Cammy Velo
1959 BSA GoldStar DBD34
LR 90 SW
1948 MG TC
Re: Instruments lights are not working [Re: 4acker] #604177
19/11/19 05:32 PM
19/11/19 05:32 PM
Joined: Mar 2010
Posts: 380
Germany
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Germany
The dimmer is ok. The lights come back sometimes for a while.I guess there is somewhere a relay that did not work but I will test the dimmer again.


2006 4/4 70th anniversary, 1985 VW 1200 50th anniversary, 1977 Vespa 50 Special, 2003 Vespa PX 200E
Re: Instruments lights are not working [Re: 4acker] #604182
19/11/19 06:14 PM
19/11/19 06:14 PM
Joined: Jul 2019
Posts: 1,078
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Luddite Offline
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Posts: 1,078
I suspect you may have an intermittent earth issue..?

The earth is usually carried via a black wire that loops along the instruments before making contact with the bulkhead or similar earthed metalwork....

IDENTIFY one of the black wire loops connections at the rear of the instruments which may be attached via the instrument clamping screw.... Once identified attach a length of wire at that point, and touch the other end of your temporary wire to bare metal in the local area, perhaps a bolt holding the steering column to the bulkhead..?

If the lights illuminate then you know it is an earth fault...?

Do not connect to any other colour of wire...or you may blow a fuse..or worse..!

Re: Instruments lights are not working [Re: 4acker] #604204
19/11/19 08:27 PM
19/11/19 08:27 PM
Joined: Sep 2011
Posts: 13,312
Mandello del Lario
Gambalunga Offline
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Mandello del Lario
Have you checked your fuses?


Peter

[Linked Image]
Re: Instruments lights are not working [Re: Gambalunga] #604208
19/11/19 08:55 PM
19/11/19 08:55 PM
Joined: Nov 2013
Posts: 380
Huntingdon
S
Scrambledsignals Offline
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Joined: Nov 2013
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Huntingdon
Originally Posted by Gambalunga
Have you checked your fuses?


Also check the connections on to the fuse box. I had a similar problem and it was tracked to a poor connection at the fuse box due to water getting in to it and corroding the connections.

Re: Instruments lights are not working [Re: 4acker] #604218
19/11/19 10:04 PM
19/11/19 10:04 PM
Joined: Jul 2007
Posts: 16,701
Suffolk
John V6 Offline
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John V6  Offline
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Suffolk
The earth is on the passenger side bulkhead on one of the bolts holding the heater box in position. If it is like the Roadster the relays for power is on the PCB which is then a replacement job at c £500


JohnV6
2006 Indigo Blue Roadster S1
Re: Instruments lights are not working [Re: Scrambledsignals] #604245
20/11/19 09:27 AM
20/11/19 09:27 AM
Joined: May 2012
Posts: 1,006
Sumerset
Rog Offline
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Rog  Offline
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Sumerset
Originally Posted by Scrambledsignals
Also check the connections on to the fuse box. I had a similar problem and it was tracked to a poor connection at the fuse box due to water getting in to it and corroding the connections.

Try whipping out the 20A Dash Module fuse and cleaning it’s spade connectors.

Third yellow in on the left I think.
[Linked Image]


Roger
2011 Plus 4
Re: Instruments lights are not working [Re: 4acker] #604297
20/11/19 02:57 PM
20/11/19 02:57 PM
Joined: Dec 2017
Posts: 671
Evergreen, Colorado, USA
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britmog Offline
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B

Joined: Dec 2017
Posts: 671
Evergreen, Colorado, USA
Remember the Golden Rule with Morgan's: If it's an electrical issue check the earths first, the "Prince of Darkness" rules.


Bruce Marshall
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: Instruments lights are not working [Re: 4acker] #604469
21/11/19 03:58 PM
21/11/19 03:58 PM
Joined: Mar 2010
Posts: 380
Germany
4acker Offline OP
Learner Plates Off!
4acker  Offline OP
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Joined: Mar 2010
Posts: 380
Germany
Hello,
many thanks for all the nice replies. The dimmer is working for sure. But I have to check the earth connections and the fuse box inside the car. The fuse box in engine compartment is covered by storage box and well protected against water. The dimmer is working fine that is for sure. It all seems to come out on a loose connection. Today and in the next it is and will be to cold to work outside. After that my temporary licesense plate will run out. Therefore I will correct the issue next year in March when my license plate allows me to drive again.

BR
Christian


2006 4/4 70th anniversary, 1985 VW 1200 50th anniversary, 1977 Vespa 50 Special, 2003 Vespa PX 200E

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