Sierra Exciter Coil 18-5143, Replaces Tohatsu 369060210M, Fits 4C, 5B, 5BS (2003)

The Sierra 18-5143 is an exciter coil built as a direct replacement for the ignition system on Tohatsu 4C, 5B, and 5BS (2003) outboard motors. The exciter coil is a core component of the outboard's ignition circuit, generating the pulse of electrical energy that the CDI unit uses to fire the spark plug at the correct timing interval. When an exciter coil weakens or fails, the outboard can develop hard starting, intermittent misfires, a rough idle, or a complete no-spark condition, so replacing it with a properly matched coil restores reliable ignition output.

This coil is a bolt-on installation, designed to mount in place of the original Tohatsu exciter coil without modification. It carries the Sierra brand's standard fit and function match to the OEM part, so it installs using the factory mounting points and wiring connections. The unit measures 1 x 6 x 2.3 inches and weighs 0.33 pounds.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5143
• Item Type: Exciter Coil
• Weight: 0.33 pounds
• Item Dimensions (L x W x H): 1 x 6 x 2.3 inches
• Installation Type: Bolt-On
• Vehicle Service Type: PWC
• UPC: 808282339975

Fitment

• Tohatsu 4C, 5B, 5BS (2003)

Replaces (OEM)

• Tohatsu 369060210M

Frequently Asked Questions

What does the Sierra 18-5143 exciter coil fit? The Sierra 18-5143 fits Tohatsu 4C, 5B, and 5BS outboard motors from 2003.

Is the Sierra 18-5143 a direct replacement for Tohatsu 369060210M? Yes, the Sierra 18-5143 exciter coil replaces Tohatsu part number 369060210M and is a bolt-on match for the factory mounting and wiring.

How much does the exciter coil weigh? The Sierra 18-5143 exciter coil weighs 0.33 pounds.

What are the dimensions of the 18-5143 exciter coil? The Sierra 18-5143 measures 1 x 6 x 2.3 inches.

What symptoms indicate a failing exciter coil? Hard starting, intermittent misfires, a rough idle, or a complete no-spark condition on a Tohatsu 4C, 5B, or 5BS outboard can point to a weak or failed exciter coil like the 18-5143.

Does the 18-5143 require any modification to install? No, the Sierra 18-5143 is a bolt-on part that installs at the original Tohatsu exciter coil's factory mounting points.

What role does an exciter coil play in the ignition system? An exciter coil generates the electrical pulse that the CDI unit uses to fire the spark plug at the correct timing, making it a core part of the outboard's ignition circuit; the 18-5143 performs this function on supported Tohatsu models.

Will the 18-5143 fit other Tohatsu outboard years or models besides 4C, 5B, and 5BS 2003? The Sierra 18-5143 is specified for Tohatsu 4C, 5B, and 5BS (2003); no other years or models are listed for this part number.

Is the Sierra 18-5143 a genuine Sierra part? Yes, the 18-5143 is manufactured and sold under the Sierra brand as an OEM-equivalent exciter coil for the listed Tohatsu applications.

What is included when ordering the 18-5143? The Sierra 18-5143 order includes the exciter coil unit itself, ready for bolt-on installation.