wires on a Briggs engine

I picked up a mower and the wiring has been butchered. I need the basics set up again. My question is the 15hp briggs has 3 wires coming out of it. two come out together (red and black) beside the starter and use the same connector to connect to the mowers harness. Another wire (black) comes out beside the carb and the previous owner had a switch installed that grounded it to the frame to cut the engine off.

My thinking is the motor must be mag fired but have an alternator to charge the battery. The sole black wire must ground the mag for shut down. The two wires must be for the alternator but I don't know what they do. Perhaps the red feeds current to the battery when the engine is running. And the black? What do they do? As noted the wiring has been all cut up--essentially there is no harness for me to work with.
 
Going to need the model information. In order to get you what you need. The Red and Black wires are most likely the battery charging wires. Other wires will be just a guess without knowing what you have. The wire by the carb could be the fuel shut off wire. See if it has a solenoid on the bottom of the carb
 
The two wires coming out of the engine cover is the alternator output. It produces ac and needs to be rectified to dc to charge the battery. The other wire is the kill wire as you said.


Aaron
 
If your 2 wires in the same plug are red and black one is probably DC charging wire and the other is an AC output for lights. I forget which is which. You can look for a diode in one of the wires but you will probably have to remove the cover and you may have to remove the flywheel. The wire with the diode will be DC to charge the battery.

If both wires were the same color they would both be AC and plug into a regulator which would mount on the engine. The output from the regulator would be DC of course.

The other black wire is the ground wire to the magneto.
 
Call Briggs & Stratton and they will send you a wiring diagram. You need the engine model number and the spec number. Hal
1-800-444-7774 Support
 
Thank you everyone. I think I have what I need. Sounds clear that I have a DC feed for the battery and a AC feed for the lights and I think it's pretty clear which is which.

But, in thinking about this, I am curious is there a way to test if current on a wire is AC or DC using a generic multimeter or a clamp on ammeter?
 
Any Ac voltage is probably from your stator. That should be around 30 volts has nothing to do with lights. You may have a rectifier/regulator that converts the AC voltage to DC voltage for charging the battery. Hal
 
Here's a B&S wiring diagram probably doesn't cover your engine. Hal
a146163.jpg
 

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