Instrum Heater Relay Mod-JN88-387 Heavy Duty

Description

Product Overview

The Instrum Mod-JN88-387 auxiliary heater relay is a precision‑engineered component designed to supply consistent electrical power to the starter motor of a variety of heavy‑duty machines. Constructed from a high‑temperature resistant alloy housing and copper‑clad contacts, the relay can handle sustained high‑current loads without overheating. It meets OEM specifications for voltage, amperage and mounting dimensions, ensuring a seamless replacement for original parts. Key specifications include a 12 V operating voltage, a maximum current rating of 30 A, and a compact form factor that fits within the standard relay bay of most tractors and utility vehicles.

Usage

This relay excels in environments where reliability is non‑negotiable. Whether you are operating a farm tractor during early‑morning planting, a commercial mower on a hot summer day, or a golf cart on a hilly course, the Mod‑JN88‑387 delivers the instant power needed for rapid engine starts. Its robust construction tolerates vibration, dust, moisture and temperature extremes typical of outdoor agricultural work. The relay is compatible with leading brands such as Ford New Holland, John Deere, Kubota, Caterpillar, Husqvarna and E‑Z‑GO, making it a versatile solution for mixed‑fleet maintenance.

Why Choose Us

Instrum has a reputation for manufacturing durable electrical components that stand up to the toughest field conditions. Each relay undergoes a rigorous quality‑control process, including thermal cycling, load testing and vibration analysis, to guarantee performance that matches or exceeds factory standards. Our direct OEM‑style design eliminates the need for adapters or custom wiring, reducing installation time and the risk of errors. Backed by a limited warranty and responsive technical support, the Mod‑JN88‑387 offers peace of mind for mechanics and equipment owners alike.

Key Features

• Reliable Engine Starting – Consistent power delivery for quick, efficient starts across diverse equipment.
• Heavy‑Duty Construction – High‑temperature alloy housing and copper‑clad contacts resist wear and heat.
• Broad Brand Compatibility – Fits Ford New Holland, John Deere, Kubota, Caterpillar, Husqvarna, E‑Z‑GO and more.
• Direct OEM Replacement – Matches factory specs for a secure fit, no modifications required.
• Ideal for Tractors, Mowers & Utility Vehicles – Restores function to farm equipment, garden tractors, golf carts and similar machines.

FAQ

What voltage and current rating does this relay support?

The Mod‑JN88‑387 operates at a standard 12 V system voltage and is rated for a maximum continuous current of 30 A, suitable for most auxiliary heater and starter applications.

Can I install this relay myself?

Yes. Because the relay is an exact OEM‑style replacement, it bolts into the existing relay socket using the original mounting hardware. No wiring changes or additional adapters are needed.

Is this relay waterproof?

The housing is sealed to meet IP65 standards, providing protection against dust and water jets, which is sufficient for typical outdoor agricultural use.

Will this relay work with my John Deere 5055 tractor?

Yes. The Mod‑JN88‑387 is listed as compatible with John Deere models in the 5000 series, including the 5055, when used as a replacement for the factory auxiliary heater relay.

What warranty does Instrum offer?

Instrum provides a one‑year limited warranty covering defects in materials and workmanship, along with access to technical support for installation assistance.