new acc problem 1979 300sd

[augusta]

I have an on going heater problem. Everything worked fine until I replaced the heater blower motor. After the replacement fuses #3 (heater blower motor) and #9 (servo and a/c compressor) blow.


I have done a search on this forum and did not find a problem like mine.

I am not going to start replacing parts until I find out what is wrong

Could it be the amplifier? My thoughts it may be sending to much current to the servo and blow motor and blowing the fuses.

Any ideas? Help

Ord