89-96054T Aftermarket Mercruiser 12V Starter Solenoid | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercury / MerCruiser 12V Isolated-Base Solenoid - Part Number: 89-96054T

New aftermarket four-terminal flat-mount solenoid for Mercury outboard and MerCruiser starter-slave or power-trim circuits whose wiring diagram specifies the isolated-base 89-96054 family. The same physical switch can be used for starter or trim-motor control depending on the original installation.

⚙️ Key Features

• 12-volt marine solenoid

• Four-terminal electrical layout

• Flat mounting bracket

• Isolated-base construction

• Suitable for high-current starter-slave or trim-motor switching where specified

• Application is controlled by wiring diagram and original solenoid number rather than horsepower alone

🧰 Assembly Contents

• 1 × Complete isolated-base solenoid - Part Number: 89-96054T

• 1 × Internal electromagnetic coil

• 1 × Internal high-current contact and plunger assembly

• 1 × Four-terminal mounting housing

• External cables, circuit breakers and mounting fasteners are not included unless supplied

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 89-8M0185143 / 89-8M0185149 → Current Mercury service references associated with the 89-96054 family

• 89-96054T / 89-96054B / 89-96054 → Earlier isolated-base solenoid references

OEM / Related Numbers:

• 89-96054T

• 89-96054B

• 89-96054

• 96054

• 850189

• 850189T

• 89-91975

• 89-8M0185143

• 89-8M0185149

Aftermarket / Verified Equivalents:

• ARCO Marine: SW054

• Sierra Marine: 18-5816

• API Marine: SW102

• Recmar: REC89-96054T

🚤 Compatibility

Commonly used on:

• Mercury outboard starter/trim electrical systems and MerCruiser starter-slave or trim-pump circuits using the isolated-base 89-96054 configuration

Typically suits:

• Mercury inline-six and V-engine outboards whose wiring diagram specifies 89-96054T

• MerCruiser petrol-engine starter-slave circuits using the same four-terminal isolated-base solenoid

• MerCruiser power-trim pump circuits using the 89-96054 electrical and mounting arrangement

• HP Range: Not horsepower controlled; match the electrical circuit and original part number

• Engine Type: Mercury outboard or MerCruiser petrol marine electrical system

• Year Range: Application dependent across legacy Mercury and MerCruiser production

• Serial / Model Identification: Confirm 12V, four terminals, isolated base, flat bracket and the original 89-96054/850189/8M0185143 family reference.

🔌 Function

The solenoid allows a low-current control switch to energise a high-current starter or trim motor. Closing the internal contacts connects battery power to the controlled motor; opening the contacts stops current flow.

Common signs of failure:

• Solenoid clicks but the controlled motor does not run

• No click with a verified control signal and ground path

• Intermittent operation from pitted internal contacts

• Motor remains energised after the switch is released

• Burnt terminals, loose studs or heat-damaged cables

• Incorrect operation caused by substituting a grounded-base solenoid

📦 Condition

• Brand-new aftermarket replacement starter/trim solenoid

• New and unused

• Supplied in suitable manufacturer or equivalent protective packaging