Blower inoperable?
 

Last year, I rebrushed the blower motor and added a 80amp bypass which seemed to do the trick ('82 300sd) in getting my A/C to function again. My blower does not work now though will when I power it directly. 80 amp fuse seems fine along with wiring - can anyone offer any ideas why I no longer have fan/blower function. CCU was fine too at the time . . . . any thoughts? Thanks! Getting warm again this weekend!

I hope you mis-typed and you have a 30 amp fuse in there. Can you swap out the CCU with a known good one?

Yes, 30 amp (I think, gulp, might have used an 80 amp as these are the same strip fuse for glow relay, yes -forgot what I used!) I have another CCU and was going to try that next . . . . thanks!

ya... I blinked when I read 80 amp... if it's got an 80 in there, and something bound up... likely the wiring is burned to a crisp...

Gotta go check now but if I remember correctly, I pulled these fuse boxes from PnP and they were the original 30amp fuses for MB versus 80 -

Sounds to me like you need to go back into the Blower Motor and inspect it and all of the Wireing connections.

I took my Blower Motor apart expecting to find worn Brushes and what I found was a corroded connection where it was crimped onto the wire going to the Brushes (I have a Siemans not a Bosch Blower Motor).

Also there is a square Box with holes in it on the Front Passanger Side Fender Well that is the Resistor for the Blower. That or the Wiring to it could have issues.

Thanks, but blower powers up perfectly when energized directly . . . . . ??? Which check resistor wiring next -thanks!