Earth cables Identification

[Marauder]

Burstner T620 on 2008 Ducato 130mj with Electroblok 99 and AD-01

Whilst fitting new starting battery I noticed two (quite thick) brown cables attached to the negative (earth) Battery terminal, these both disappear under the plastic coverings so I am unable to trace them.

Can anyone identify their function pls ?

Thanks

Steve

 

[gus-lopez]

They quite possibly go to make general earth points elsewhere in the vehicle save having them all nrought right back to the battery?

 

[EuroTrotters]

Most likely common earth tails

 

[SandraL]

On our hymer ,with electrobock, I believe they go to the electroblock, one for fridge, the other for charging. Brown is often the ground cable or negative in electroblock ,german,wiring.