I have a 1984 300D whose directional signals and power windows have both failed. Where can I obtain a readable wiring diagram? Also, is there a controlbox for the turn signals? If so, where is it located? Thanks.

The windows & blinkers aren't on the same circuit! The blinkers are controlled thru the combination relay(biggest) in the rear of fuse box. The power windows should have 2 fuses that power-up lt. rear & rt. front, & rt rear & lt. front windows.
Many times the hazzard switch sticks & wont allow the blinkers to work!

Is that part...the voltage supply relay or the fleasher relay??

Thanks.

call the 800 MB number
 

and ask for the "electrical troubleshooting manual" for this car - excellent manual and relatively inexpensive at around $30 something. Covers all of the vacuum system too.