Help with Problem X axis Stepper Please

[howser37]

Ok im gonna have a go at this repair tomorrow but just want to check a few things first with you guys as my electronics knowledge is minimal lol,so a few questions.

1. For the track jumper repair i can only find/source solid core wire with 0.6mm core unless i use something ridiculously thick like a core from lighting twin and earth, however im slightly worried by the max amp rating of 1.8 amp for the 0.6 solid core wire as i am not sure how much current goes through this track. Would i not be better using say 3 amp stranded wire?.

2. I would like to ground the heatsinks to avoid the need for the micah washers to isolate the driver chips agsinst the heatsink. However is this simply a case of grounding the mounting bolt of each heatsink to the case via maybe one of the standoffs on the corner of the pcb?. Or ground it to where the incoming earth is grounded to the case? Or is it more complicated than that?. Grounding seems to be a bit of a dark art reading about it on some threads.

3. I want to check the wiring from the db9 to the stepper motor as suggested for a short or breaks etc, is there a method for doing this, i have a multimeter but ive not much idea how to use it other than the continuity test.

Thanks
Adam