Well now it gets interesting. When I measured at the battery the ripple was underneath 100mV or so.

These were taken measuring across the battery:



This was taken measuring at the radio's connector:


For comparison here is my 300D. I measured it at the dome light connector which was the easiest to access. Hmm probably not the best comparison, maybe I'll go out and get one off the cigar lighter I think thats on the same circuit as the radio.





So it looks like alternator is putting out okay. But there might be a poor connection or something...causing it to end up at 600mV of ripple at the radio's connector.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k