Why won't my outboard crank when I turn the key?

Electric start: won't crank (no click / click only) · Symptom: Turn key; nothing happens or only a click.

Quick answer: Most often: kill-switch lanyard not attached, not in neutral (neutral safety switch), weak/dead battery. Start here: Confirm lanyard clip is seated on the stop switch. If that doesn't fix it, work through the checks below, and see a marine mechanic if you're unsure.

Likely causes (most to least common)

Kill-switch lanyard not attached
Not in neutral (neutral safety switch)
Weak/dead battery
Loose or corroded battery cables / ground
Blown fuse
Faulty starter relay/solenoid or starter motor

Safe owner checks & fixes

Confirm lanyard clip is seated on the stop switch.
Shift firmly into neutral and retry.
Check battery charge with a voltmeter; charge or swap if low (correct voltage: check your owner's manual / battery label).
Clean and tighten both battery terminals and the engine ground.
Check fuses per owner's manual "Replacing fuse" section.
Manual-start models or emergency: owner's manuals describe an emergency rope start procedure — follow yours exactly.

Parts / tools

Voltmeter/multimeter, wrench set, wire brush, spare fuses (rating per manual), battery charger.

Call a marine mechanic when

Battery is good and connections clean but still only clicks (starter/solenoid); any burning smell, hot or melted wiring; repeated fuse blowing. If you're on the water and unsafe, call TowBoatUS/Sea Tow or the Coast Guard (VHF 16).

Sources

Values not stated here are model-specific; check your owner's manual.