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side lights

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side lights Empty side lights

Post by Guest Wed Aug 16, 2023 12:37 pm

Hi. just noticed that some marker lights aren't working on my 2013 wiltshire merc
theres 3 side markers on each side,
2 at the top front & 2 at the top rear.
the rear top and 2 side rears are working, but the front top and 2 side fronts aren't working.
i checked the bulbs and they are fine.
so i thought it's a broken wire somewhere, so i tapped into the wiring where i knew it worked and wired it up to a side marker light.
now the one i tapped in to doesn't work and the other sides are flashing occasionly but the majority of the time aren't working either?
i disconnected the link wire and it's still doing it?

any ideas pls? this is baffling me
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Post by PLOUGHLIN Wed Aug 16, 2023 1:02 pm

The marker lights are powered through the EM50 unit via the vehicle battery, behind the driver's seat? you could remove the relevant fuse in the EM50 or disconnect the VB to reboot the EM50. might work?

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Post by Guest Wed Aug 16, 2023 1:34 pm

PLOUGHLIN wrote:The marker lights are powered through the EM50 unit via the vehicle battery, behind the driver's seat? you could remove the relevant fuse in the EM50 or disconnect the VB to reboot the EM50. might work?
thanks for that, just had a look and mines EM40, took the fuse out and disconnected it from the batteyr but still doing the same?
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Post by Guest Wed Aug 16, 2023 2:44 pm

right put it all back to how it was and now it's working how it was.
not flashing anymore but still the front 2 side markers & front top markers aren't working
any ideas pls?
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Post by davemarshall Wed Aug 16, 2023 4:34 pm

Normally the marker lamps are simply wired through the sidelight circuit ie when you turn on the sidelights the marker lamps also come on. Are the lamps fitted in a fibreglass  pod? if so check the earthing is good to the bulb holders.
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Post by Guest Wed Aug 16, 2023 4:40 pm

davemarshall wrote:Normally the marker lamps are simply wired through the sidelight circuit ie when you turn on the sidelights the marker lamps also come on. Are the lamps fitted in a fibreglass  pod? if so check the earthing is good to the bulb holders.
David
they defo go through the EM40 as theres a fuse that says marker lights, no they aren't in a fibreglass pod, there's 2 wires that go to a bulb holder for the side lights which holds a halogen bulb, and the fronts are led's
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Post by Guest Thu Aug 17, 2023 11:25 am

just spoke to sargent to see if they couls shed some light on it.
they said the rear ones are powered by the EM40 but the ones that ren't working they think are powered by the mercedes side.
i've checked all fuses that i could find with no joy.....
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Post by Peter Brown Thu Aug 17, 2023 11:28 am

I no longer have my Merc to check but I think all interface between Merc and chassis is fused on the door side panel on the side of the drivers seat and connections are made under that seat.
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Post by Peter Brown Thu Aug 17, 2023 11:37 am

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Post by Guest Thu Aug 17, 2023 12:01 pm

Peter Brown wrote:I no longer have my Merc to check but I think all interface between Merc and chassis is fused on the door side panel on the side of the drivers seat and connections are made under that seat.
thanks for that, i've checked all those fuses and they're all good sadly
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Post by Peter Brown Thu Aug 17, 2023 12:23 pm

If you read the book linked above it suggests that a relay to control those lights should be under the drivers seat.
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Post by Guest Thu Aug 17, 2023 2:19 pm

Peter Brown wrote:If you read the book linked above it suggests that a relay to control those lights should be under the drivers seat.
found the relay, swapped it for the one beside it, and still didn't work
tested the red coming in and that read 13v, tested the yellow/black as thasts the colour of the marker wire and it read 0.03 v so i'd guess the signal wire is a fault somewhere?
am i right? if so where the earth does it get the signal from lol
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Post by Peter Brown Thu Aug 17, 2023 3:28 pm

Don't think I can help further without hands on - sorry
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Post by FreelanderUK Thu Aug 17, 2023 4:17 pm

Does you van run a Can bus system , this can cause problems if wires are changed as it detects a change and thinks there is a problem

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Post by Guest Thu Aug 17, 2023 4:18 pm

FreelanderUK wrote:Does you van run a Can bus system , this can cause problems if wires are changed as it detects a change and thinks there is a problem
yes it's a merc they are notorious for the canbus, but nothing was changed before it went wrong that i know of
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Post by FreelanderUK Thu Aug 17, 2023 4:22 pm

Have you put back to original wiring and the initial problem, check that all order lamps are working non brighter than the other which indicates an earth fault

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Post by PLOUGHLIN Thu Aug 17, 2023 4:29 pm

smitch6 wrote:
yes it's a merc they are notorious for the canbus, but nothing was changed before it went wrong that i know of

From the Body builder link PB posted it seems the lights not working are fed from the MB supply, possible a fuse gone either under diver's seat or one under dash on the passenger side?

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Post by Guest Thu Aug 17, 2023 4:31 pm

i have checked all fuses
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