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TSM32 · Vehicle control

TSM Basic

In production

Replace stock TSM/TSSM on J1850 Harley-Davidson builds with a harness-friendly module, including a low-cost lights-eliminator mode for minimal custom wiring.

TSM32 PCB
PCB

TSM32 is being developed for builders who remove stock TSM/TSSM modules and want a cleaner, simpler electrical strategy on Harley-Davidson J1850 bikes.

For minimal custom builds, it supports a low-cost eliminator-style mode focused on preventing nuisance warning-light behaviour without requiring full indicator-control features. For fuller replacements, advanced blinker behaviour is in active development.

The project direction is broad J1850 Harley fitment, but we still publish compatibility honestly per tested configuration. If a setup is not validated yet, it is treated as a target, not a guaranteed result.

Use cases

Chopper and custom rewires

Remove stock TSM/TSSM hardware and keep the electrical system intentionally minimal.

Budget warning-light elimination

Use the low-cost lights-eliminator mode when the goal is to remove stock module warnings without adding full blinker logic.

Harness-first retrofit builds

Keep installation practical by targeting stock-style connector and harness workflows.

Capabilities

Each capability is labelled by how far it has actually been taken.

  • TSM/TSSM replacement workflowImplemented
  • J1850 integration baselineImplemented
  • Plug-in stock-harness strategyTested
  • Check-engine/security light eliminator modeImplemented
  • Full blinker-function replacement modeExperimental
  • Broad Harley-Davidson J1850 fitmentExperimental

Key features

  • Replacement for stock TSM/TSSM module
  • Check-engine/security light suppression for custom wiring contexts
  • Harness-first installation approach for stock-style connectors
  • Minimal-lights-eliminator operating mode (no indicator logic)

Technical specifications

Specifications are provisional and, unless stated otherwise, are design targets that have not yet been fully validated.

Vehicle integration

Primary target
Harley-Davidson J1850 motorcycles
Stock module replacement
TSM/TSSM (application dependent)
Install style
Plug-in harness-first (target)

Operating modes

Lights eliminator mode
Implemented
Full indicator-control mode
Experimental

Electrical

Supply voltage
9-16 V (target)
Reverse-polarity protection
Yes (target)

Protocols

SAE J1850

Compatibility

Designed for Harley-Davidson motorcycles that use a J1850 interface, especially custom/chopper builds deleting stock TSM/TSSM modules.

Platform focus
Harley-Davidson with J1850
Build style
Custom/chopper and stock-harness conversions
Wide model coverage is a project goal, but each bike/configuration should still be validated before being treated as a confirmed fit.

In the box

  • TSM32 module
  • Harness notes (digital)
  • Basic install mapping reference (digital)

Known limitations

Please read before applying

  • Full blinker replacement is not yet validated across all target bikes.
  • Installation quality and wiring condition materially affect outcome.