Hey all ... I am reconstructing Uniflite 'electronic modules' (aka 'E.M.'s - these are simply 3 different 6-circuit wiring loom nylon connector blocks (red, green & blue) ... 2 [red & green] with 5 diodes tied together and 1 [blue] with 4 diodes; 2 pairs of diodes tied together independantly) that form part of a twin screw boat's '7 POINT W DUAL HELM' alarm panel circuitry ... to allow a test function of 7 12VDC incandescent lights (on each of 2 panels [these 'lights' are AMP Incandescent Panel Indicator light capsules and supposedly use a 2162 (or equivalent) bulb that draws 0.1A, each, at 14VDC] that are normally never tested at the same time), and, a selectable acoustic alarm function (<1" compact all-weather enunciator [amperage draw unknown] on upper helm flybridge station and a bell [amperage draw unknown] for lower helm salon / interior station). For those inclined to help me out and who prefer schematics to descriptions in order to properly assess current demands, I can upload those as required.
The way Uniflite mounted the E.M.'s to a multiple wiring loom termination base with a clear plastic cover (latter probably meant to prevent errant physical contact and/or act as a dust cover) inside the flybridge fibreglass cowling (typically dry-ish compartment) right below a potential water entry point (forward masthead light that has evidently seen servicing and poor wire entry re-sealing) resulted in the inevitable ... water dripped down onto the E.M. assembly, and, over time, collected in the bottom of the clear cover (great design eh?), immersing the lowest E.M. (blue) and resulting in severe corrosion damage.
In sourcing replacement diodes for the SYLVANIA ECG 125's that had been used by Uniflite back in 1978, I was provided with generic 1N4007's, however, now that I'm ready to recontsruct the E.M.'s, I have found cause for concern over the amperage ratings of the two similar part numbers ... it seems the ECG 125's were rated for 2.5A @ 25° C whereas a cross-over part like NTE 125's are rated at 1A @ 75° C ... as are the 1N4007's.
So, the ECG 125 / NTE 125 'Average Rectified Output Current @ TA' amperage values are seemingly test temperature dependant ... could this also be said for the 1N4007's as well?
Thanks, K Mc