[Duncan]

Bad idea

The pre-charge system operates by charging the capacitors through an extra resister (I use a kettle element)

So when you close the first contactor - no current flows
Then you close the pre-charge contactor
Then you close the second main contactor

Using two pre-charge systems simply can't work

 

[Duncan]

BAD IDEA
You should use two main contactors - it's a legal requirement here and is should be elsewhere

Only one of them should be part of the "pre-charge" system

You do NOT want to be opening either of those contactors everytime you take your foot off the throttle - bad idea and will lead to the contactor failing SHUT

I would suggest that the BMS warning is more like an Oil Pressure light
It should NOT "do anything" so much as be a BIG warning that something is wrong

Not sure if you are using AC and can use re-gen

I'm using a series DC motor so Re-gen is not an option

This does mean that I can use a very simple circuit to shut the throttle down to zero whenever I touch the brakes