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  #1  
Old 07-13-2019, 09:01 PM
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W123 Painted Cluster needles and Retrofitted LED's

Needles used Testors Tangerine Orange and Testors Paint thinner 3:1 ratio. The paint thinner helps avoid brush marks caused by the thick paint.


From left to right:
1)Blue- High Beam
2)Red - Battery
3)Amber - Brake pad wear sensors
4)Red - Parking Brake

Not shown:
5) Amber - Seat belt
6) Amber - Glow Plugs

The prism / fiber optics are both Amber. Also replaced the turn signals, Octopus, and Hazard light switch with Leds.

The cluster small bulb 74's are a ***** because the original bulbs are soldered onto the plastic twist off cap. Had to solder my own wire to the new LED's and solder them to the metal connections that hold the plastic cap to the cluster board.





If anyone has a spare cluster plastic lens/cover, and or the indicator icons...shoot me a PM.

Last edited by Wusha; 07-13-2019 at 10:22 PM.
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  #2  
Old 07-14-2019, 08:26 AM
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Looks great.

One thing though. You will have to keep the 3 W incandescent bulb in the battery light. It needs this for the alternator to charge properly. The electrical characteristics of LEDs are incompatible with the voltage regulator.
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  #3  
Old 07-14-2019, 12:37 PM
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Jaybob, could not a regulator of sorts fix this?
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Old 07-14-2019, 01:05 PM
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Can anyone tell me what the benefit to putting LEDs in idiot lights is?

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Originally Posted by okyoureabeast View Post
Jaybob, could not a regulator of sorts fix this?
No.
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  #5  
Old 07-14-2019, 01:12 PM
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I am not sure if LED bulbs give off more or less heat. If more heat, there may be a concern with distorting the indicator icon films.
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  #6  
Old 07-14-2019, 01:15 PM
rikflaxman
 
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Has anyone been able to find out which is the best product among those listed here?
https://11must.com/best-clamp-meters/
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  #7  
Old 07-14-2019, 06:54 PM
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Quote:
Originally Posted by jay_bob View Post
Looks great.

One thing though. You will have to keep the 3 W incandescent bulb in the battery light. It needs this for the alternator to charge properly. The electrical characteristics of LEDs are incompatible with the voltage regulator.
Thanks,

Could you elaborate for sake of my own ignorance? How does a 3w bulb allow the alternator to charge? (My car is a 1983 300D turbo , if that changes anything)

I will look into this. Thank you for the warning
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  #8  
Old 07-14-2019, 07:20 PM
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The 3w bulb provides resistance which is needed to allow the alternator to charge. Mercedes automobiles are very sensitive concerning the wattage of bulbs used in the tail and stop lights also. Not using the correct wattage bulb will disable the cruise control.
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  #9  
Old 07-14-2019, 10:38 PM
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Post Spare Binnacle Lens

Your gauge needles look great ! .

When asking for parts, always give your location, you'll be pleased by the response from folks you didn't even know lived near you that have parts.....
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  #10  
Old 07-14-2019, 10:45 PM
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Quote:
Originally Posted by party View Post
Can anyone tell me what the benefit to putting LEDs in idiot lights is?



No.
Pardon me, my electrical engineering know-how is next to nothing.

I meant, couldn't we add a resistor post LED to create the same effect?

Edit: love the safety hat orange too OP!
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Old 07-14-2019, 11:00 PM
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Quote:
Originally Posted by BWhitmore View Post
The 3w bulb provides resistance which is needed to allow the alternator to charge. Mercedes automobiles are very sensitive concerning the wattage of bulbs used in the tail and stop lights also. Not using the correct wattage bulb will disable the cruise control.
Not doubting you as the German engineers are not all that adept in regards to how electricity works in fact, they treat it as though it has some "mystical" properties beyond mere human comprehension, but I am questioning whether the use of a front/rear/tail light marker LED bulb would have any effect on the cruise control.

I can see the stop/brake light bulb having an effect but the marker/tail?

I don't think the lighting circuit is involved with the cruise since it can be engaged without the lights but I've been wrong many times before.
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  #12  
Old 07-14-2019, 11:03 PM
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Quote:
Originally Posted by vwnate1 View Post
Your gauge needles look great ! .

When asking for parts, always give your location, you'll be pleased by the response from folks you didn't even know lived near you that have parts.....
Thank you and for the tip
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WTB list: (1983 300d)
-Exterior rocker panels below doors
-Gauge Custer plastic window/indicator icons

(1983 300D Turbo)
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  #13  
Old 07-14-2019, 11:28 PM
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I mis-spoke. . The stop light bulb resistance is the bulb that will have an effect on the cruise control, not the tail light bulbs. This issue has been discussed many times on this forum. Refer to posts by James Dean, the forum cruise control expert.
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  #14  
Old 07-14-2019, 11:29 PM
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Quote:
Originally Posted by Mike D View Post
Not doubting you as the German engineers are not all that adept in regards to how electricity works in fact, they treat it as though it has some "mystical" properties beyond mere human comprehension, but I am questioning whether the use of a front/rear/tail light marker LED bulb would have any effect on the cruise control.

I can see the stop/brake light bulb having an effect but the marker/tail?

I don't think the lighting circuit is involved with the cruise since it can be engaged without the lights but I've been wrong many times before.
Only LED brake lights will affect the cruise control, I found this out the hard way and with help from the forum here. The tail lights, reverse lights and blinkers will not affect it (although the blinkers need resistors to blink correctly).


To the OP - I would take a night drive to see how bright the new LED bright light indicator is. I had to put the original incandescent bulb back in because it lit up half my car.
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  #15  
Old 07-14-2019, 11:50 PM
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@JayBob

Is the recharging ability of the alternator affected because of LED polarity or something else?

The LED on my Battery light is non-polar, just like the 74 bulbs.

Quote:
Originally Posted by BWhitmore View Post
I mis-spoke. . The stop light bulb resistance is the bulb that will have an effect on the cruise control, not the tail light bulbs. This issue has been discussed many times on this forum. Refer to posts by James Dean, the forum cruise control expert.
Only able to find 3-4 threads from him. Non bulb related.

EDIT: The correct username is JamesDean , no space.
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WTB list: (1983 300d)
-Exterior rocker panels below doors
-Gauge Custer plastic window/indicator icons

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