Engine Block Heater for Dodge Ram Cummins (1987-2002) 3.9L & 5.9L Diesel 4BT 6BT

1000W Heavy-Duty Machined Steel & Nickel Chrome Plated Block Heater
Fits 1987–2002 Cummins 3.9L (4B/4BT) & 5.9L (6BT) Diesel Engines

Upgrade your cold-weather starting performance with the most powerful and durable block heater available for the Cummins B-Series. This premium 1000-watt block heater outperforms the common 600W versions and is engineered to deliver reliable heat output in the harshest climates.

We have installed these heavy-duty heaters in our own engines for years due to their unmatched performance and longevity. After countless customer requests, we are now offering them individually.

Why This Block Heater Stands Apart

• Massive 1000W output for significantly faster and more efficient engine warming

• Precision-machined, heavy cast steel housing, nickel-chrome plated for corrosion resistance

• Long, high-performance copper heating element for superior thermal transfer

• Made in the USA — NOT a lightweight imported unit

• Durable 6-foot heavy-gauge power cord included (120V AC)

• Replacement for LR1843 block heater

• Includes full installation instructions

Unlike flimsy stamped-metal alternatives, this heater features solid metal construction designed for long service life, especially when used with a heater controller such as the Power Badger® to maximize efficiency.

Fitment

• Fits ALL 1987–2002 Cummins 3.9L (4B/4BT) and 5.9L (6BT) diesel engines

• Works in any vehicle using these engines—pickup trucks, tow trucks, industrial equipment, marine applications, and more

• Ideal for replacing an original heater or adding one to an engine that never had it

Installation Information

• Standard mounting location for 1989–2001 Cummins 3.9L & 5.9L: right side center core plug hole

• Direct replacement for OEM 5.9L Cummins heaters marked LR1843

• Designed for smooth, safe starts in temperatures below 30°F

This block heater is a must-have upgrade for dependable cold-weather performance.