when i break the fault bulb light comes on.

fred54321 · Post by **fred54321** » 20 Apr 2006, 08:26

i have a volvo 850 25litre 20 valve 1993.when i breack the bulb vault light comes on started a couple of days ago.replaced one nearly burnt out bult plus blown one.plus a few others i replaced for save measure.still the vault bulb light still comes on.help

Post by **billofdurham** » 20 Apr 2006, 11:24

I had a similar problem with brake and indicator bulbs. Neither were blown but the warning light came on intermittently. Check that the earth connection in the bulb holder is making a good contact. It can be eased up a little to tighten it.
Worked for me.

M81388 · Post by **M81388** » 20 Apr 2006, 12:14

Check the 3rd brake light in the middle, attached behind the rear head rests. This one is easy to forget about.

l33tDad · Post by **l33tDad** » 20 Apr 2006, 14:31

Plus one of the bulbs may be loose. When I bought my '93 850, I had the same problem. I found that the glue holding the brake bulbs together wasn't working anymore and making the bulb short out. I just replaced all the bulbs and the problem went away. Easy $25 fix..

fred54321 · Post by **fred54321** » 21 Apr 2006, 07:42

gave up trying replaced most bulbs still warning light on

fred54321 · Post by **fred54321** » 21 Apr 2006, 13:05

when i brake the vault light comes on does that mean rear light fault or can it be any bulb vault???

Post by **MadeInJapan** » 22 Apr 2006, 00:05

Could be bad connection....some corrosion on the seating area where the bulbs are attached. Try a little sand paper or an emory board.

fred54321 · Post by **fred54321** » 22 Apr 2006, 13:56

could it be my tow bar socket causeing the problem.i do not use it.if so how do i sort it.

Post by **billofdurham** » 22 Apr 2006, 15:28

Depends on how the towing socket has been wired.

It should be wired to the socket in the boot/luggage area which is fitted at the factory for that purpose. This, in effect, allows the bulb failure device to work normally.

If it has been wired by someone who does not know Volvos it may be that the towing socket has been spliced into the wires at the tail lights. In this case a false signal will be sent to the bulb failure device and would cause your problem.

Trace the towing socket wiring back into the boot/luggage area and see how it has been done. If it has been spliced then remove the wires at the joins. If it has been wired to the factory fitted socket pull the plug out with the towing wires attached and try your lights without it.

fred54321 · Post by **fred54321** » 22 Apr 2006, 15:38

ok thanx for that will look tomorrow