C4 C100 bulkhead connector

[purple charlie]

Before i get in a mess, presumably this is the c100 connector, cant get it apart has been sealed with black mastic.sits behind the battery

 

[Llewelyn]

You can get it apart and the mastic is factory. Just be patient and careful - I will say if you're tracing a fault, unless you're 100% sure it's probably not that connector. They are very well sealed.