6631168 Bobcat Heavy Duty Micro Relay - 50 Amp Upgrade - Resistor Protected - 12V 5-Pin - Replaces 7213038 / 7025819

Heavy Duty Micro Relay for Bobcat — Replaces 6631168 / 7213038

Stop replacing relays every few months. The factory Bobcat relay is rated at 35 amps — but the traction lock solenoid's inrush current exceeds that rating on every startup. Over time, the contacts pit, weld shut, and fail. This is the 50-amp heavy-duty upgrade with built-in resistor suppression that protects your Bobcat's computer (ECU) from voltage spikes. Replaces Bobcat 6631168, 7213038, and 7025819.

The Problem

This little black cube is actually the root cause of about 50% of all "Traction Lock" failures. Here's what happens: the traction lock solenoid draws a massive surge of current when it first engages. This arcing gradually pits the relay contacts. Eventually, the contacts weld shut — meaning the solenoid stays energized 24/7. That leads to:

• Dead battery overnight — the solenoid is draining power even with the key off
• "Open Circuit" fault codes — erratic relay behavior confuses the ECU
• Burned-out solenoid — the relay fries the solenoid coil from continuous duty overload
• Machine won't move — same symptom as a failed solenoid, but the relay is the actual root cause

The Upgrade

This isn't just a replacement — it's an upgrade:

• 50-amp rating (vs the factory 35A) — handles the solenoid's inrush current without arcing
• Built-in resistor suppression — protects the Bobcat ECU from voltage spikes when the relay switches
• Micro ISO form factor — drops directly into the factory fuse panel position

Specifications

• Bobcat OEM Part Numbers: 6631168, 7213038, 7025819
• Type: Micro ISO Relay (5-Pin)
• Voltage: 12V DC
• Current Rating: 50A Normally Open / 30A Normally Closed (HD Upgrade)
• Pin Layout: Standard 30, 85, 86, 87, 87a
• Protection: Built-in Resistor (ECU spike protection)
• Size: Micro ISO (~1" × 1" black cube)
• Condition: Brand New

Identification

• Location: Fuse/relay panel — typically under the seat, behind a panel, or in the engine bay
• Visual ID: Small black cube (approx 1" × 1") with 5 blade terminals on the bottom
• Fuse Panel Positions: Look for the relay labeled "Traction Lock" — but this same relay is also used for Fuel Shutoff, Headlights, and Auxiliary circuits
• Tip: Check the schematic on the relay body — the resistor-protected version shows a small rectangle symbol across pins 85/86

Compatible Equipment

This relay fits all Bobcat models that use the 6631168 / 7213038 / 7025819 micro relay:

Bobcat G-Series, K-Series, M-Series

• Bobcat S130, S150, S160, S175, S185
• Bobcat S205, S220, S250, S300, S330
• Bobcat T190, T200, T250, T300, T320
• Bobcat 753, 763, 773, 863, 873 (verify PN)

Multi-Position Fit

Every Bobcat has 5–8 of these relays in the fuse panel — controlling the traction lock, fuel shutoff, headlights, auxiliary hydraulics, and more. They're all the same part. If one has failed, the others are the same age and likely close behind. Consider buying a multi-pack and replacing them all at once.

Why Buy From Trenchwell?

• 50-Amp Upgrade: The factory relay is 35A. This is 50A — it handles the solenoid's inrush current without arcing, welding, or failing. Stop replacing relays every month.
• Resistor Protected: The built-in resistor absorbs the voltage spike when the relay switches, protecting your Bobcat's ECU from damage. The cheap aftermarket relays don't have this.
• $14.95 Insurance Policy: This relay controls your traction lock, which controls whether your machine moves. A $15 relay prevents a $129 solenoid replacement — or worse, a $1,500+ chaincase repair from a dragging parking brake.
• Replace All of Them: You have 5–8 of these in the panel. They're all the same age. Replace the lot and be done with relay gremlins for years.

Frequently Asked Questions

How do I know if my relay is bad?
Swap it with another identical relay from the fuse panel (e.g., the headlight relay). If the traction lock starts working with the swapped relay, your original relay is bad. This is the fastest diagnostic — takes 30 seconds.

Why does this relay keep failing?
The factory 35A relay is under-rated for the solenoid's inrush current. Every time the solenoid engages, the surge arcs across the relay contacts, gradually pitting them until they weld shut. The 50A upgrade handles the surge without arcing.

Should I buy more than one?
Yes. Every Bobcat has 5–8 of these relays controlling different circuits. They're all the same part number, same age, and subject to the same wear. If one has failed, the others are close behind. Buy a few extras and replace them all during one service session.

What does "Resistor Protected" mean?
When a relay coil de-energizes, it generates a reverse voltage spike (called back-EMF). This spike travels back through the wiring and can damage the Bobcat's electronic control unit (ECU). The built-in resistor absorbs this spike, protecting the computer. Look for the small rectangle symbol on the relay schematic — that's the resistor.