Avant/branch manager rotation troubleshooting

[ATH]

Just bought a Branch Manager T1010 last week.

The wiring harness to switch from grapple to rotation was not attached... Pretty sure this was the first time the technicians have seen that harness for an Avant... It took a minute to figure out how it was supposed to go. It did not rotate at first. Then we realized the plug was turned. All was working well when I left.

I hooked it up today to practice a little bit at the shop before bringing it on to a job site. Rotation is not working. Regardless of which position the switch is in, it just opens and closes a grapple.

I confirmed continuity between all the wires, and everything seems connected. What am I missing?

I know there are different joysticks on different models of Avant, here is mine. (2024 model 528)

 

[Boomslang]

I just had this problem on my BMG. Turns out there was a bad connection even though everything felt tight.

Really check the connection where the BMG and Avant electrical meet.

 

[Cereal_Killer]

See if you actually feel the solenoid / magnet switch with your hand to rule out a hydraulic issue before you get too far down the electrical gremlin path. It’s on the left side of the boom.

I assume you’re on the right path with the wiring harness but you never know on a new machine now days; I’ve tightened so many bolts and plugged in so many connectors on brand new machines…

 

[ATH]

See if you actually feel the solenoid / magnet switch with your hand to rule out a hydraulic issue before you get too far down the electrical gremlin path. It’s on the left side of the boom.
...

Thanks...so if I have my hand on the solenoid while someone toggles the switch I should feel it?

 

[Bart_]

Is it new or used? Used, machine or attachment, internal wire fatigue breaks right at a connector can cause intermittent operation. Had such a wire on a car door power window motor. Manipulations during debug always seemed ok continuity but on reinstall the wire hung just right to trigger the intermittent behaviour. Took forever to conceive and find that gremlin.

Like trailer lights, test for volts at the expected wires, then volts while delivering specced load current ie maybe a lightbulb draws the same as the solenoid, (while flexing wires) . Then independent source like jumpers off a battery power the solenoid connector pins listen for click (flexing), finally check for sucky pins - corrosion, bent etc. Deoxit, straighten/tighten, sandpaper, dielectric grease.

Beyond that is fried componentry.