Recently purchased a 1995 268 Grady w/ Twin Johnson 175's.
Appears that neither engine is charging. I measured the impedance w/ a DVM on Diode setting) of the rectifiers and found both to be damaged in my opinion:
STB: w/ neg lead of DVM on Red wire coming from rectifier, get conductance on both yellow wires from rectifier (w/ pos DVM on yellow wire), no conductance w/ leads reversed. Tach is NOT operational.
Port:
Appears that neither engine is charging. I measured the impedance w/ a DVM on Diode setting) of the rectifiers and found both to be damaged in my opinion:
STB: w/ neg lead of DVM on Red wire coming from rectifier, get conductance on both yellow wires from rectifier (w/ pos DVM on yellow wire), no conductance w/ leads reversed. Tach is NOT operational.
Port:
w/ neg lead of DVM on Red wire coming from rectifier, only get conductance on one yellow wire from rectifier (w/ pos DVM on yellow wire), no conductance w/ leads reversed. Tach appears to be operational.
QUESTION: is the base of the rectifier the "neg" side of the bridge? I believe the gray wire is for the Tach; not sure what the purple wire is for. I do not get any conductance w/ the neg lead of the DVM on the yellow wires from the rectifier the purple or gray wires or the base of the rectifier.
Please advise on my conclusion and the question re: the "neg" side of the bridge.
QUESTION: is the base of the rectifier the "neg" side of the bridge? I believe the gray wire is for the Tach; not sure what the purple wire is for. I do not get any conductance w/ the neg lead of the DVM on the yellow wires from the rectifier the purple or gray wires or the base of the rectifier.
Please advise on my conclusion and the question re: the "neg" side of the bridge.
