Purpose of extended cable

[Gatsoburner]

Can anyone offer light on the extended / additional red cable.
Build data on the car quotes 'Battery master Switch'.
Im wondering if this is that and if so, how does it work.

Cheers in advance

 

[ExMX5owner]

One is for power to the car, lights locks etc, the other is to alternator crank high current stuff, the yellow plug is a small pyro charge to disconnected the high draw in the event of a crash, to prevent fires etc... It goes off at the same time as the two on the inside mounts of your seatbelts, pretensioners if you like, and your airbags, and a couple of unanticipated bodily functions . Lets face it, you've already been involved in an accident and been yanked back into seat so hard your teeth flew out and are now firmly embedded in your forehead by the airbag going off, no need to add Mr Chrispy to the list. So I hope you never need to test it ... . This little blighter can cause you to question the Loom of Doom, dont ask me how I know...

See here https://zroadster.org/threads/z3-battery-cable-route.42375/

 

[Gatsoburner]

I've experiences if the Doom Loom, dare I say it wasn't too bad but did concern me locking me out of the car!, glad I was home is all.

Odd design feature going separately but I guess maybe not in 1999 2000 era.

Thanks for the reply

 

[ExMX5owner]

I've experiences if the Doom Loom, dare I say it wasn't too bad but did concern me locking me out of the car!, glad I was home is all.

Odd design feature going separately but I guess maybe not in 1999 2000 era.

Thanks for the reply

I,m not sure if it disconnects the auxiliary jump start terminals in the engine bay however, I cant see how it can, should or be required. Someone smarter than me can answer that. . But I suspect the reason it was done that way, is the proximity of the fuel tank to the battery..