Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Moderate — 2–4 hours
Overview
Show original supplier description
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Bosch |
| Part Number | B00G 2121390916 |
Videos
How To Easily Check Alternator Diodes
How to Repair Your Own Alternator (With Simple Tools)
SYMPTOMS OF A BAD VOLTAGE REGULATOR
Alternator internal component testing #1405
Quick Alternator Diode Test
Disassembling an alternator #shorts
Generator Alternator Rotating Diode Works / checking made it simple / Exciter / Cummins /Hyundai
Alternator dioda replacment
volkswagen Audi Bosch Alternator Generator replaced the regulator brushes ,Reglerbürsten getauscht
Bosch Slip Ring #alternator #rotor
BOSCH Alternator Regulator Replacement & Alternator Brush change
How to change Alternator rectifier &repair #repair #shorts #carrepair #alternator
Alternator Regulator BOSCH for Mahindra Bolero #shorts #youtubeshorts #shortsvideo
Mercedes - Voltage Regulator DIY Change, Fail Symptoms, Testing - R129, W124, W140, W202 and Others
Bosch Alternator Voltage Mod (15.3v)
GM Truck OEM Alternator Upgrade 6 Phase 200+ Amp
GM's AD 244 Series 2 pin vs. 4 pin Voltage Regulator. How to activate these alternators
Chevy Truck NOT CHARGING? Replace THIS NOW!
Top 5 Problems 2000-06 GMC Yukon Sierra Chevy Suburban Tahoe Silverado Avalanche Cadillac Escalade
Why This ALTERNATOR SAVED MY TRUCK & ELECTRIC FANS!
Mechanic States Chevy Alternators?
FACTORY Electric Fan Conversion! Best Mod For 99-04 Silverado/Sierra/Yukon/Tahoe (Free Horsepower!)
We’re here — turning wrenches, just like you.
Call us, follow along, or come say hi.
Buy with Confidence
Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return PolicyShipping
Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.
View Full Shipping Policy