Nice job trying to keep it real instead of putting in a modern ricer radio.

Wire colors don't match modern standards.
red = constant power
gray = dash lights
black = switched power
brown = ground
blue = power antenna trigger

white cap/red & black leads = left speaker
black cap/green & black leads = right speaker

When you bench test it, you will need to rig some sort of antenna or you will get nothing but static. A short piece of wire stuck in the center hole of the antenna plug will do.

Look in the radio well for an unused 2 pin connector that has constant power and illumination on it. If not you will have to tap the fuse box for these. On a 123 IIRC fuse 2 is constant power and dash lights on fuse 1.


If you can't get it to work contact Ed at Becker in NJ he can make it right. beckerautosound.com

If it turns out to be DOA don't chuck it, Ed is always looking for core radios for parts.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech