F348 Brake Accumulator Pump Power Supply

I’m getting inconsistent power supply to the brake accumulator pump at the fuse/relay.

The wiring diagram shows that the fuse is Terminal 30 direct from battery, and indeed I do get battery voltage at the fuse when the ignition key is off. However, when I turn the key on, the voltage at the fuse drops to almost zero.

This is very strange because Terminal 30 should be continuously on.

I’m trying to locate the junctions/points physically in the car for the Terminal 30 line from battery positive post all the way to the brake pump fuse.

I’m having a hard time finding these points. Where in the car is the first battery positive connector post/junction shown in the wiring diagram. Also, the diagram shows a “ABS connector” that splits the Terminal 30 to two different fuses for the ABS.

These are the two main points I need to check, but can’t find them physically in the car.

Hopefully someone here might know these locations so that I can test the points.

 

I found the “ABS (power) connector”. It was in the bunch of wires below the row of ABS relays/fuses. A large red wire (Terminal 30) connected to and splitting into a smaller red and a smaller white wire supplying the relays. It had come loose. Problem solved.