W124 Interior bulbs blowing - why?

M

Molesworth2

Guest
I bought a 1993 W124 E220 coupe a couple of months ago (110k miles) and this forum has been great for fettling advice. But I have now replaced three interior bulbs (two on heater controls, one on auto gearbox indicator light) and now a bulb on the instrument dash has blown. Is there a likely cause for so many bulbs to blow?
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,074
Reaction score
322
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
Do check that the running voltage of the car is no more than 13.8 volt,
 

wireman

Senior Member
Joined
Sep 20, 2005
Messages
2,632
Reaction score
3
Location
lancashire
Your Mercedes
nice 201 2.5D 1993 & very nice 129 SL500 1994
My 124 lost each lamp over my first winter, I think that the short time between sequential failures is an example of just how good the manufacturing quality of the small bulbs is, the replacements I used were spec'd for 3000 hours but that is not including cold switching effects which will shorten the lamp life significantly. Typically if they are all from the same batch they will all die at about the same time.
Iv'e just replaced most of them again after 6 years and 110k.

Beware that the T 1 1/2 wedge base lamp is available in several ratings, the 1 watt will melt some of the plastic if inadvertently installed in the control knobs, I used 0.4 watt for them all.

Mine came from CPC, stock code SC00352 £3.71 for 10.

Dodgy alternator brushes can cause voltage transients which wont be particularly good for any lamps.
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,074
Reaction score
322
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
My 124 lost each lamp over my first winter, I think that the short time between sequential failures is an example of just how good the manufacturing quality of the small bulbs is, the replacements I used were spec'd for 3000 hours but that is not including cold switching effects which will shorten the lamp life significantly. Typically if they are all from the same batch they will all die at about the same time.
Iv'e just replaced most of them again after 6 years and 110k.

Beware that the T 1 1/2 wedge base lamp is available in several ratings, the 1 watt will melt some of the plastic if inadvertently installed in the control knobs, I used 0.4 watt for them all.

Mine came from CPC, stock code SC00352 £3.71 for 10.

Dodgy alternator brushes can cause voltage transients which wont be particularly good for any lamps.

I use the same ones from CPC Ring RU509T you have to squeeze the contacts together a bit for a good fit
 
OP
M

Molesworth2

Guest
  • Thread Starter
  • Thread starter
  • #5
Voltage Too High?

Many thanks for the quick, helpful replies. Minor delay while I sourced a multimeter! Checked voltage at battery: 12.3V without engine running, when idling it was showing 14.3V. Is that too high?
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,074
Reaction score
322
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
As long as it does not go over 14.3 at say 2k rpm then should be OK
 

peterwhayward

Senior Member
Joined
Oct 4, 2011
Messages
865
Reaction score
3
Location
grays essex
Your Mercedes
E240 classic est 2000 2.4
If as you say the car is a recent purchase,it could just be that those bulbs were recently fitted (to help sell the car) and were cheap rubbish ones.
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,074
Reaction score
322
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
If as you say the car is a recent purchase,it could just be that those bulbs were recently fitted (to help sell the car) and were cheap rubbish ones.

Or as I had once, I took the cluster out to change 1, put it back in and 3 others had gone, just an age thing probably on the bulbs
 


Prestige Motor Group is Hertfordshire's Premier INDEPENDENT MERCEDES BENZ SPECIALIST. We offer a service exceeding Main dealership expectations and HUGE savings on Main Dealership Prices. WE BEAT ANY GENUINE QUOTE! Prestige Motor Group pride ourselves on delivering excellent customer service as we believe the customer and the Car deserve the best.
Tel: 01462 672458www.prestigemotorsofhertfordshire.co.uk/
Top Bottom