OutdoorKing Repair Forum Forums Restoring, Customising and Modifying Tech Talk victa pro with tecumseh 13 hp wiring troubles.

Leshby, the green wire is the normal ground wire for the alternator, there is no need to do anything with it, it is already grounded.
Edit: the above statement is incorrect. That is a dark green wire, and it is not grounded, it is connected to an insulated terminal. It is the engine's kill wire, and needs to be connected to the mower's kill circuit.

The only wires you need to be concerned about are the two alternator outputs: one AC, one DC. This is a slightly odd practice Tecumseh had: the idea was that only the battery charging circuit needed DC, the mower's lights were perfectly happy with AC, and that saved the trouble of rectifying part of the alternator output.

I'll explain the peculiarities of the Victa Pro 12's alternator connections. The intention was that the unrectified AC output from the Briggs' alternator was simply connected to the mower's wiring as shown in the diagram. The alternator output consisted of alternate positive and negative half waves. The mower cunningly fed the positive half waves to the charging circuit, and the negative half waves to the lighting circuit, separating the two voltage orientations by use of two diodes, one facing each way. These acted as traffic lights directing the positive and negative half waves as they intended.

Now it gets a bit trickier: I can't find your engine's type number in the Tecumseh tech manual. However there is one system that looks like yours, and you can verify whether it is actually the right one by feeling back along your red output wire to see if what looks like a slight bulge a few inches from the end, is actually a small cylindrical object (a diode). Here is the system and its description, from the Tecumseh manual:


Here is how you can test it, if you have a multimeter:

Essentially, if the diode is there, I think this will be what you have, but if you are handy with a meter, you can have some fun checking it out.

Now, if that system is what you have, and if your Pro 12 still has the wiring shown in the manual and reproduced earlier in this thread, you have a couple of ways you can proceed, depending on what you consider neat and workmanlike. If you want a system that works the same way as the Briggs one, just plug the AC output wire (yellow) into the same place the Briggs alternator output used to go, and safely put the DC wire (red) somewhere it won't cause any trouble by touching anything. If you want to use all the wires you have just for neatness, connect the red wire where the Briggs one went, and connect the yellow wire to the mower's white wire in the headlight circuit. Personally I think I'd wire it the Briggs way, because it is simpler and much easier for people to figure out later.

Of course we have to recognise that you've had the mower rewired, so whether it now looks anything like the system I posted above, from the mower's manual, is a mystery.