Leavin' the "Engine Run" switch on (?)

[WEC4104]

Thanks for the add'l info Len. It is very likely you are right about the audible buzzer being lost in the conversion to negative ground (long before my purchase).  I checked around the rear door area and there is no sign of any switch left in that area. I have a new switch to install and have already run new wiring to the dash area.

Selenium rectifiers? Is that right next to the flux capacitor?    I think I'll dump the selenium rectifiers and replace them with dilithium crystals.  That outta get my Detroit Warp Drive unit rocking.

[DrivingMissLazy]

Selenium Rectifiers are for Real. They are the predecessor of the silicon diodes that most people nowadays are familiar with. They use a combination of selenium to make a one way device.

It they are still installed in your 4104, they are in the electrical compartment beside the drivers left arm. They are typically red in color, about 1.5 inches square and consist of several flat pieces of metal with a bolt in the center to hold them together.
Richard