What exactly do you mean by "bulk head"connectors? I am not familiar with this ten. I have, however, started going through, and cleaning many of the connectors.
Chris the "bulkhead connector", or "firewall connector" is causing a lot of problems for a lot of people. It's the huge rectangular connector where all the wiring feeds into/ out of the firewall. The big problem is, the charging current goes in the connector, through the ammeter, and back out the connector. Even Ma knew this was a problem, because on cars with larger alternators, they added extra wiring with rubber feedthrough grommets, and on the larger cars, finally went to an "external shunt" ammeter
Read this excellent article on why. Look a the simplified diagram down the page which shows the battery and alternator charge path through the connector
