The 25 amp fuse for #5 blows like trying to put a 12 volt bulb in a 110 volt socket.

From the fuse designation - USA ; back-up lamp, heating water valves, water pump, climate controll system, relay auxiliary fan term. 86, aut. transmision electics, blower motor inside temperture sensor, air conditioner compressor, electormagn. clutch/valve air injection.

With the air conditioner compressor unpluged it still blows- time to write the Mercedes forum and see if search turns up anything? -simular but not exactly.

Have muli-meter but not sure how or what to check next.

Having gone through all the wiring I could find under the hood and under the car - I could not find any obvious bare or damaged wire.

Try removing the RELAY for the air-injection pump clutch...at position "E" in the fuse box.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

So now I guess I need to find out what is wrong with the air injection pump-

and thanks for the jump start

inspected the wires to the air-injection pump clutch and there is an in-line two prong plug and no damage is obvious- so I assume its in the clutch itself?

Looks like I`m good to go for now thanks

Air injection pump is a warm-up emission device...the clutch is MOST likely drawing excessive amperage...very common..just leave out the relay.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator