DVPARTS Ignition Switch for New Holland Boomer Tractors — 86405634 Direct-Fit, Durable OEM Replacement

DVPARTS Ignition Switch 86405634 is a replacement starter switch engineered to restore reliable ignition and electrical control for New Holland Boomer, T and TC series tractors and many Case models.

This heavy-duty replacement ignition switch from DVPARTS offers a direct-fit solution when the original switch wears out or fails. Built to match the electrical and mechanical specifications of OEM parts, it accepts multiple part numbers (86405634, 86405635, 87577812, 86400226) and fits a wide range of agricultural tractors so you can get equipment back to work quickly. The design focuses on compatibility, durability, and straightforward installation to minimize downtime in the field.

Which tractors will this ignition switch fit?

This switch is compatible with many New Holland Boomer, T and TC series tractors as well as several Case and Farmall models. Before purchasing, compare your machine's part number or original switch shape to ensure correct fitment.

• Fits New Holland: BOOMER 2030, 2035, 3040, 3045, 3050 and T/TC series like T2210–T2330, TC29D–TC35DA, TC40A–TC45DA.
• Also fits Case models: D35–D45, DX29–DX45, Farmall 31/35/40/45/50, L350A.
• Accepts replacement part numbers 86405634, 86405635, 87577812, 86400226 for cross-reference.

How straightforward is installation for a replacement?

Installation is designed to be direct — the switch replaces the original unit and connects to the same wiring harness when part numbers and mounting match. For safety, disconnect the battery before beginning and consult your tractor manual for panel removal steps.

• Direct-fit shape and mounting points for many Boomer/T/TC dashboards.
• Wiring terminals match OEM layouts; verify terminal labels before reconnecting.
• Battery should be disconnected and polarity checked during replacement.

What are the build and reliability features to expect?

DVPARTS builds this ignition switch with materials suitable for agricultural use, balancing electrical contact integrity and mechanical wear resistance. It’s intended to restore dependable starting, accessory power selection, and secure off positions under typical farm conditions.

• Durable contact surfaces to resist arcing and wear from repeated starts.
• Robust housing to withstand vibration and dashboard mounting stress.
• Manufactured to meet common OEM electrical specs for compatibility.

Will this switch affect tractor electronics or accessories?

When installed correctly, the replacement switch should operate accessory circuits and ignition like the original, without altering system behavior. If your tractor has aftermarket electronics or modifications, verify load and wiring compatibility to prevent overcurrent or miswiring.

• Restores ignition, starter engage, and accessory positions per original design.
• Works with standard electrical systems; check for aftermarket additions first.
• Properly crimped connectors and secure terminal seating reduce electrical issues.

Who this is for: This ignition switch is intended for farmers, landscapers, equipment mechanics, and owners of New Holland Boomer, T and TC series tractors or compatible Case and Farmall machines who need a reliable, OEM-alike replacement part. It’s a practical choice when the original switch fails, shows wear, or causes intermittent starting, and for workshops that service multiple tractor models and require cross-referenced part coverage.