If the airconditioning and heater fan are used much, all 1984-87 760s, and all 740s and 940s (not the 940SE) will eventually wear out the fuse holder for these functions. It is fuse 14 on the early 700 series, and fuse 16 on the later 740s and 940s. The heater fan and AC quit working at all on my daughter's 1987 744T, and the fuse block looked like this. Fuse holder 16 is melted.


I was originally going to bypass fuse 16 with an external fuse holder, but this fuse block was so bad I decided to replace it. Replacing takes a little more time but it isn't hard to do. Get a good fuse block. Disconnect the battery ground before you start. Remove the ash tray, fuse cover, cubby hole, and radio. Then you can lift up on the Central Electric Unit, pull it towards you, and turn it over. Yes, the wires are long enough. They were made to do this.

Once the CEU is out and turned over, this is what you will see.


Everything is color coded to it's location. The supply wire for each fuse is in the plastic socket,and is marked with a wrap of black tape. Remember this. Some supply wires feed more than one fuse, as the fuse supply sides are connected inside the fuse block. The supply wire for fuse 16 also supplies fuses 14 and 15 on this car. If you are uncertain, take a picture with a digital camera before you start removing wires.

Once the wires are removed, use a small screwdriver to raise the black plastic over the three lips on the front of the fuseholder. When re-installing the wires, be sure to push them all of the way onto the spade fittings. I use needle nose pliers for removing and re-installing the wires.
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john