Actually, upon further inspection of the circuit, there seems to have been a major reversion in 1991. For the 1991 model year, the aux fan circuit contains NO FUSE. WTF MB?

The above fix works if you have anything other than a 91. If you have a 91, do the above and then cut the red wire going to the high speed relay, and insert a fuse holder inline. I guess 15 or 20A would be about right.

1990 and older. Fan circuit is protected by fuse.


1991. No fuse in circuit, add one.

__________________
Ich liebe meine Autos!

1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete
1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday...
1981 Mercedes-Benz 300SD | Rear ended, retired in garage.
2009 Yamaha AR230HO | Das Boot

Excessive speeding? It ain't excessive till I redline!