Sierra 18-5103 Ignition Pickup, Replaces 3780600, Fits Chrysler 318/340/360/440 Inboard Engines

The Sierra 18-5103 Ignition Pickup is an electronic ignition pickup built as a direct replacement for the Chrysler inboard ignition system, part of Sierra's Chrysler Inboard Electronic Ignition Kit lineup. It replaces OEM Chrysler ignition pickup number 3780600, allowing boat owners to restore reliable spark timing without sourcing an increasingly hard-to-find original Chrysler part. The pickup fits Chrysler M318, M340, 360, and 440 CID inboard engines, as well as the 318, 340, 360, and 440 CID engines used later, giving it broad coverage across Chrysler's marine V8 lineup.

This ignition pickup is a compact component measuring 0.39 x 0.39 x 0.39 inches and weighing 0.18 pounds, designed to mount within the distributor assembly and generate the trigger signal the ignition module uses to fire the spark at the correct moment. It uses a male connector for straightforward wiring into the existing harness. As a wear item that governs ignition timing accuracy, a failing pickup can cause misfires, hard starting, or a no-spark condition, making the 18-5103 a common maintenance and troubleshooting replacement for Chrysler-powered inboard boats.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5103
• Category: Chrysler Inboard Electronic Ignition Kit
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.18 pounds
• Connector Gender: Male
• Installation Type: Coil-on-plug
• UPC: 030999318336

Fitment

• Chrysler M318, M340, 360, 440 (1972-82)
• Chrysler 318, 340, 360, 440 (1983-88)

Replaces (OEM)

• 3780600

Frequently Asked Questions

What engines does the Sierra 18-5103 ignition pickup fit? The Sierra 18-5103 fits Chrysler M318, M340, 360, and 440 CID inboard engines from 1972-82, as well as Chrysler 318, 340, 360, and 440 CID engines from 1983-88.

What OEM part number does the 18-5103 replace? It replaces Chrysler OEM ignition pickup number 3780600, so any boat calling for that OEM part can use the Sierra 18-5103 instead.

Is the 18-5103 an OEM or aftermarket ignition pickup? The 18-5103 is a Sierra aftermarket ignition pickup manufactured to replace the original Chrysler 3780600 unit, giving the same fit and function without needing the discontinued OEM part.

How much does the Sierra 18-5103 ignition pickup weigh? This ignition pickup weighs 0.18 pounds.

What are the dimensions of the 18-5103? The Sierra 18-5103 ignition pickup measures 0.39 x 0.39 x 0.39 inches, a compact component sized to fit inside the distributor assembly.

What type of connector does the 18-5103 use? It uses a male connector for wiring into the existing distributor and ignition harness.

What symptoms indicate the ignition pickup needs replacement? A failing ignition pickup like the 18-5103 typically causes misfires, hard starting, or a complete no-spark condition because it can no longer send an accurate trigger signal to the ignition module.

Does the 18-5103 work with both the 1972-82 and 1983-88 Chrysler engine ranges? Yes, the Sierra 18-5103 covers both ranges: Chrysler M318, M340, 360, 440 (1972-82) and Chrysler 318, 340, 360, 440 (1983-88).

Is the 18-5103 part of a larger ignition kit? The 18-5103 is listed under Sierra's Chrysler Inboard Electronic Ignition Kit category, alongside related components such as ignition modules and spark plug wire kits.

What is the installation type of the 18-5103 pickup? It is a coil-on-plug installation type ignition pickup designed to work with the Chrysler inboard distributor system.