MONOBLK - LED Hyperflash Relay Mod Fix

I modify the indicator relay to accept the lower power draw of LED bulbs. The factory shunt resistor that is used to measure current draw of the indicator bulbs was replaced with a 180 ohm resistor. Original value is 23 mohm.
This allows me to run LEDs without the dreaded hyperflash and to retain the bulb out condition in the event one of the bulbs are malfunctioning.
5:10 - Schematic study
6:45 - Hands on relay tear down
17:30 - Data gathering on power draw of bulbs
23:45 - Data analysis and resistor selection
37:45 - 1st modification, disable hyperflash permanently
40:07 - Resistor examination
42:21 - 2nd modification, solder newly selected shunt resistor
45:45 - Modified relay install
46:34 - Final test
/ monoblk124
/ monoblk

[@Evo_Spec]

I don't think I will be able to do the proper calculations without a (don't know what it's called) power supply? to find the values of the LED I will be using but I just wanted to comment and say this this video is super cool and answered the exact question I was asking myself.

[@akakimtvralashvili3538]

hello bro..I own w124 m111 1994 year meqanic transmision 2.2L..and mine relay sometimes do not works..if I push left or right on this relay with my hand its working..I opened and visually its good looking-what the metter if you know?

[@ebutuoyebutouy]

Thank you. Awesome. Any links to the bulbs u bought? I have a 93 w201 and a 94 s124. U could place a dual color led in the reverse light socket for extra indication, w a proper socket? I'm going for the pin 7 option.

[@John5788]

For the fronts I am using this one: www.amazon.com/iBrightstar-Switchback-Projector-Replacement-Daytime/dp/B07JC7233R
For the rears I am using this one: www.amazon.com/gp/product/B075Q9RGZW
You cannot put dual color LED/switchback in the rear, there is no wiring for it unless you have something custom or different than standard US configuration. The rear side indicators do not have an active running state like the fronts.

[@ebutuoyebutouy]

@@John5788 Thank you so much. I did not even know that 1157 bulbs came in dual color. Had to educate myself on the term Switchback.
Your bulb selection is impressive. One of the few suppliers who clearly lists wattage and uses a proper built in voltage regulator, not just a resistor.
I'm going to also use the reverse light as an extra brake light by changing pigtail from 1156 to 1157 and installing a Switchback red/white bulb.
Amazon's red/white pricey, FBay not to bad. And yes, white will be a little on the dim side. Thanks!

[@John5788]

@@ebutuoyebutouy OK I see what you mean now. Interesting concept to use reverse as an extra stop light indicator. The lens is white, how do you manage to get around this? Do you have non-standard rear tail light lenses? Even with a red/white switchback bulb, it won't match the red stop indicator coming from the red lens.

[@ebutuoyebutouy]

@@John5788 Thanks for sharing. Assumed since led has only one frequency and lens not incandescent only one wavelength would radiate? Did not think of that. Thanks for warning. I'm going to invest and order FBay 391379492698. Will let u know if it's reasonable. S124 (124 wagon) brake light undersized. 201 allows upgrading a tail light spot. Thanks. Is sponsor Jeff 190rev's CaptainRuff?

[@John5788]

@@ebutuoyebutouy You are correct, LED only has 1 wavelength red and will not get filtered out by the white lens. I'm just not sure how it would look passing through 2 different lenses, might not match.
And yes, that is the same Jeff we are talking about.