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This is the same style of harness many owners reference online when they’re trying to run certain Bobcat-branded attachments on 8-pin machines. A lot of people only discover the compatibility issue after they’ve already purchased an attachment—then find it won’t plug into Cat (8-pin), ASV, or Terex machines because the attachment wiring was designed around a different interface.
From an equipment-owner standpoint, that limitation is frustrating. So we engineered a practical workaround: we built the harness, validated it with real customer installs, documented what we learned, and then made it available so the next operator wouldn’t have to start from scratch. This version is built to be straightforward to install while staying flexible across common attachment layouts.
How does it work?Many Bobcat-branded attachments route controls through an on-attachment CanBus module. For a large number of attachments, that extra layer isn’t necessary for basic function control. This bypass harness skips the module and carries the machine’s control signals directly to the attachment solenoids. The machine-side plug connects to your 8-pin harness, and the attachment-side leads connect to the valves.
Know your output limits:Your machine must have enough available circuits for what you’re trying to run. For example, many Cat A/B/C series loaders provide four electrical outputs—so if you’re attempting to operate an attachment that expects more controlled outputs (such as some cold planer configurations), you may not have enough circuits to command every function the way you’d want.
4 solenoids doesn’t always equal 4 functions:This harness is designed to control four solenoids. On some attachments, a single function may use two solenoids. Please verify your attachment’s valve/solenoid arrangement before ordering, or check your known installation notes. If you need to drive more solenoids, look at a 6-output bypass option.
Real-world benefit:Some owners even use this approach to simplify wiring and reduce nuisance shutdowns by eliminating extra modules and connectors. Fewer components often means fewer failure points.
For Cat/ASV/Terex machines using an 8-pin Deutsch output: this harness is designed for that 8-pin style connection and routes control outputs to the attachment solenoids accordingly.
It’s designed to let certain 8-pin machines operate Bobcat/Erskine/Quick Attach–style attachments by bypassing the attachment’s intermediate control electronics and routing control directly to the attachment solenoids.
It’s commonly used with 8-pin machines such as ASV/Terex and Caterpillar machines that use the older 8-pin style setup (often referenced as “up to 2014” in typical fitment guidance). If you’re unsure, confirm your machine has an 8-pin auxiliary connector before ordering.
It’s aimed at Bobcat/Erskine/Quick Attach–branded attachments that were originally set up in a way that limits compatibility across brands. The goal is to restore more standard plug-in operation on an 8-pin machine.
This is a 4-output harness, meaning it’s intended to control up to 4 solenoids from the machine side.
No. Some attachments use two solenoids to perform a single function. Always verify how many solenoids your attachment uses per function before assuming it will control everything.
If your attachment requires more than four controlled circuits (for example, higher-function attachments), this 4-output harness may not be enough to run all features. In that case, you’d need a higher-output solution instead of trying to force this harness to do more than it’s built for.
This harness is offered with different solenoid-end connector styles (commonly Delphi or Deutsch). You must select the connector style that matches your attachment solenoids to avoid install headaches.
Match what is physically on your attachment today. If your solenoids/harness use a molded, blocky connector style you may need the Deutsch option; if your setup uses the smaller two-pin style commonly seen on certain older harnesses, you may need Delphi. When in doubt, compare your solenoids and existing plugs carefully before ordering.
No—this harness is intended to be ordered in the connector configuration you need, so you don’t have to rely on separate adapters.
On affected attachments, there may be control electronics located between the machine connector and the solenoids. This harness is designed to remove that middle step and instead send control power/signals straight to the solenoids.
If the machine only provides limited electrical outputs, the harness can only deliver what the machine can supply. You may be able to run simple attachments, but complex attachments that need more controlled circuits may not function fully.
It’s commonly used as an attachment-side solution for compatibility. Whether it’s treated as semi-permanent or moved between attachments depends on how your attachments are set up and how often you need to switch.
Confirm your machine uses an 8-pin auxiliary connector, confirm the attachment’s solenoid count and wiring needs, and confirm the solenoid connector style (Delphi vs Deutsch) so you order the correct version.
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