Voltage Regulator for John Deere Replaces:MIU11504, 691188, 491546, 793360 ;#G344T3486G 34BG82G45478

What It Is

This voltage regulator converts AC voltage from the mower’s alternator stator into regulated DC voltage to charge the battery and power electrical components. It’s designed for riding lawn mowers and garden tractors—primarily John Deere models, but also compatible with some other brands using the same OEM connectors.

Fitment & Compatibility

• Replaces OEM part numbers: MIU11504, 691188, 491546, 793360, plus cross-references G344T3486G, 34BG82G45478.
• Fits John Deere models: Common on L100, L110, L120, L130, LA100 series, D100-D130, X300, X304, X320, and select Sabre/Scotts tractors built in the 2000s. Not for zero-turn or walk-behind mowers.
• Check before buying:
  • Measure the mounting hole spacing: original regulator has two holes ~2.5 inches apart center-to-center.
  • Verify connector type: this uses a flat 2-pin (spade) connector—not a round pin or 3-wire plug.
  • Confirm your mower has a separate voltage regulator (some older models have a regulator integrated into the engine control module).
• Polarity: This is a negative-ground unit. Don’t use on positive-ground machines (rare, but check your model).

Key Things to Know

• Quality: Aftermarket unit at a fraction of the OEM price ($15 vs $40+). Most users report it works fine, but a small percentage get DOA units—test with a multimeter before permanent install.
• Installation difficulty: Easy—disconnect battery, unplug old regulator, remove two bolts, swap in the new one, reconnect. Takes 15 minutes.
• Common gotcha: If your battery still won’t charge after replacement, the stator may be bad. Test stator output (AC voltage at idle, should be 20-30VAC). Also check for corroded wiring or blown fuse.
• Heat sink: Mount to a clean metal surface for cooling. No thermal paste needed, but ensure screws are tight.

Should You Buy It

If you have a compatible John Deere riding mower with a dead or failing regulator, this is a solid budget pick. It’s cheap, fits most common models, and the installation is straightforward. For a quick fix on a mower that’s not worth an OEM part, it’s a no-brainer. But if you want maximum reliability or have a rare model, consider the OEM version.