Non-Automotive / Other

Cummins/Onan

CUMMINS/ONAN CONTROL BOARD FITS HGJAB & HGJAC MODELS

$847.88

SKU: C021 300-5374

In Stock
In Stock
Ships by Jun 9
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Cummins Onan 300-5374 is a replacement generator power supply circuit board. This control board is specifically designed as a direct replacement for Onan Part Number 300-5374 and is compatible with certain Onan HGJAB and HGJAC generator models. It's an essential component for the proper functioning of these generators, providing the necessary power supply and control.

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

BrandCummins/Onan
Part NumberC021 300-5374

Videos

Replacing A Onan Generator Circuit Board

Replacing A Onan Generator Circuit Board
onan generator troubleshooting

onan generator troubleshooting
Onan RV Generator runs but no electric - watch this fix

Onan RV Generator runs but no electric - watch this fix

Buy with Confidence

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 Policy