Cannot find voltage regulator

[Jrybon]

I'm working on a Husqvarna YTH22v46 96045006100 lawn tractor. The patrts algorithms say it has a Briggs & Stratton <UPDATED> motor 44N677-0005-G1. Where the heck is the voltage regulator?? ~John

 

[ILENGINE]

The 170808 doesn't mean anything past being a husqvarna part number. We will need the actual model number from the engine which should be located on the OHV cover opposite the fuel pump. And if your mower doesn't have an electric pto clutch it may not have a regulator. It could be the 3 amp battery charge with a 5 amp headlight circuit.

 

[Jrybon]

You are right. That was a serial number. I have changed it to say 44N677-0005-G1, tho I have not verified that information with my own eyes.

Not having a VR makes sense, because I couldn't find one. So what keeps the battery from draining when not in use?

 

[ILENGINE]

You are right. That was a serial number. I have changed it to say 44N677-0005-G1, tho I have not verified that information with my own eyes.

Not having a VR makes sense, because I couldn't find one. So what keeps the battery from draining when not in use?

A picture of the wires coming out from under the flywheel would help us determine which charging system you have. But assuming the 3/5 charging system. The battery is prevented from draining by a diode in the wire coming from under the flywheel that charges the battery. It also acts as a half wave rectifier to convert AC to DC to charge the battery. The headlight circuit is a 5 amp AC system which is fine for the headlights.

 

[sgkent]

I get the funny feeling that the question "where is the voltage regulator" is really an answer to another question like why won't my engine start, or why isn't the battery charging etc.. Is it?

 

[Jrybon]

That all sounds right. That's what I am seeing. So is there a way to test the diode?

 

[Jrybon]

SGKENT is correct. I am diagnosing a battery drain

 

[ILENGINE]

With the dual circuit charging system. You should have a red and a black wire with a white connector next to the starter. The red wire will have a shrink tube with a bump in it. that is the diode. You can pierce the wire above the diode with a ohm meter probe and the other probe to the corresponding terminal in the connector. One way will have a low ohm reading and if you reverse the probes should see very high ohm reading like in the megaohm readings or OL on the screen.

You can also unplug the connector and while running the engine at full speed put a meter between the red wire terminal and ground and see what voltage reading you get. in DC output from the black wire will be in AC for the headlights.

 

[Jrybon]

Okay. No reading either way. Bad diode.

THE HEDLIGHTS ARE AC?!

 

[ILENGINE]

Okay. No reading either way. Bad diode.

THE HEDLIGHTS ARE AC?!

No reading either way wouldn't drain the batter but would prevent charging. And the headlights are AC because they use alternating current directly from the stator.