Big Sprayer Hexa Alt issues

Hi
Testing a hexa spraying platform, running Copter 3.5.3.
When I engage the pump on ch7, LIDAR (LW20 serial) readings drop to 0 and the copter starts gaining alt, disabling the pump all back to normal.
Pump system consists of DC motor and DC ESC.
Link to BIN attached.
Any ideas?
Thanks!
Anton
LOG

I just noticed that the wiring might be compromising the data coming from LW20.
Here is a point of intersection between power cables going to the pump and serial cable coming from the lidar.

Seems like a false alarm, after seeing some other logs, I am sure the LW20 lidar is reading the beam reflected from the spray. Therefore I might need a solution for getting access to reading #2(last) of the LW20 instead of #1(first), if anybody has a clue, please let me know.
Thanks!