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  #1  
Old 06-02-2019, 04:46 AM
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W115: Change or replacing bulbs to LEDs

Just took a look at the rear tail light assembly for the W115 and was surprised to see that there doesn't appear to be an easy way to remove the back panel to change the bulbs like in the W123.

Am I missing something?

Last edited by Screwdriva; 06-02-2019 at 05:05 PM.
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Old 06-02-2019, 05:25 AM
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Fairly simple. Open boot. Locate and unscrew large plastic "wheels" on the back of the light housing. Slide outer plastic lens away from the body. Remove and replace bulbs. Be gentle with the lens as they can crack at the curvature where the directional portion meets the main body. It is 40+ year old plastic.

If the lenses haven't been removed in years the gaskets may be sticky. Don't force them. Re-install the thumb wheels a few threads and give the studs a gentle rap or two with a soft mallet. You might need to remove or reposition the spare tire for better access to the right side studs.
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Last edited by Mike D; 06-02-2019 at 05:38 AM.
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Old 06-02-2019, 05:00 PM
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Cheers Mike! Super easy but WOW...what a difference the Osram P21W LED lights make! Faster and brighter illumination.

I was able to clean the lens and reflector as well. All in all, took 30 mins but highly recommended.

Next step is to replace the 10W tail lights/ interior and the festoon bulbs. Anyone have the bulb sizes/ #'s?
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Old 06-02-2019, 07:14 PM
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https://www.superbrightleds.com/moreinfo/instrument-panel-light-bulb/194-led-bulb-5-smd-led-tower-miniature-wedge-retrofit-car/206/919/?year=1974&make=49&model=81&scc_id=1416

Be advised, the standard 194 will work but you MUST bend the leads on the bulbs where they do not "wrap" around and make contact. It only took me three fuses to figure out the fault. Do NOT use the CAN bus version as they will not work.

W115: Change or replacing rear bulbs-ledcon1.jpg

W115: Change or replacing rear bulbs-ledcon2.jpg

W115: Change or replacing rear bulbs-ledcon3.jpg



I tried these in a W123 but was not happy with the light distribution:
https://www.superbrightleds.com/moreinfo/miniature-wedge-base/194-led-bulb-1-led-miniature-wedge-retrofit-car/197/852/

They might work fine in the /eight. I haven't gotten around to installing them in my coupe so I can't give a definite answer on them.

https://www.superbrightleds.com/vehicle/1976-mercedes-benz-280c-vehicle-led-lights?make=49&model=81&year=1976

Just got the 5LED's delivered. I'll post pictures of them later on today.

One LED and the 5LED

W115: Change or replacing rear bulbs-p6020008.jpg
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Last edited by Mike D; 06-03-2019 at 03:10 PM. Reason: Added stuff
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Old 06-03-2019, 07:49 AM
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Quote:
Originally Posted by Mike D View Post
If the lenses haven't been removed in years the gaskets may be sticky. Don't force them. Re-install the thumb wheels a few threads and give the studs a gentle rap or two with a soft mallet.
Instead of rapping, I would suggest gentle pressure on the thumb wheels allowing the lenses to slowly separate from the sticky seals. Sometimes it's necessary to insert a small pick between the lens and the seal to free a troublesome spot. Above all, take your time and do no harm.
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Old 06-06-2019, 02:17 PM
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Also there should be four other screws that attach the inside housing to the body of the car. Often times these screws knock off the paint a bit and water gets in there and initiates taillight rust. I recommend taking the whole light fixture out, checking for bare metal or rust, and fixing it with POR15.

-Henry
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Old 06-07-2019, 06:07 PM
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Quote:
Originally Posted by cleeves View Post
Also there should be four other screws that attach the inside housing to the body of the car. Often times these screws knock off the paint a bit and water gets in there and initiates taillight rust. I recommend taking the whole light fixture out, checking for bare metal or rust, and fixing it with POR15.

-Henry
Did just that. No rust anywhere in sight. That said, I'll probably need to replace the rear taillight rubber surround on both sides
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