Good afternoon, folks; this might be a bit of an odd one. We have noticed that our handbrake light on the dash is not always coming on in wet conditions causing the car to lose power when parked up. It goes dead and will normally restart 1st time.
I'm wondering if there is a handbrake sensor or switch in the rear of the system that could be shorting and killing electrics in the car.
I haven't had her on a computer yet, but I can do it tomorrow. It only seems to happen when it's on wet roads.
Her hand brake has just been done, but this has been ongoing for a while, with a new battery, etc, on her.

It's not the electric one as a 2012 GS

The light switch is at the handbrake handle not at the drum end

Are there any sensors or switches down at the drum end, do you know?

No apart from the ABS sensor and pick up