All connectors on our bikes are well shielded against ingress of moisture.
For those that put stock in the above statement, I'll warn that this is pure fiction or more likely wishful thinking. While the connectors have electrical shields on many, it is certainly not all, and "shields" has a different meaning than "sealed", which they are not. Further, the shields are plastic, so heat and low humidity, makes them harden and shrink over time. Ever work on a 70's Honda that lived 20 or more years in the desert? Rust is not much of an issue, but anything plastic based is well deteriorated, often cracked and shrunk. Environment plays a key role in the viable life of most machines, in operation or not, garaged protected or not.
Fuse contacts are connections. Not sealed.
Headlights have connectors. Not sealed.
The 4 way connectors in the headlight bucket are not sealed.
None of the block connectors are hermetically sealed.
Switch contacts on the bike are not sealed from the elements.
Tin contacts corrode in the presence of moisture, oxygen, and impurities. Unless your connections are hermetically sealed, they oxidize and form a resistive film over time.
Connector technology, and indeed, improvement is plastic formulations has improved, most notably in the 80's when computer tech invaded the automotive industry. The low voltages and currents these devices operate on made any signal loss or voltage loss critical for reliability concerns. Enter the sealed connectors now pervasive in modern machines. 70's Hondas were sold before this availability, so they suffer from connection deterioration, with severity of deterioration commensurate with the environment in which they experienced.
