How to troubleshoot a JLG 400S lift basket with no power?

[George]

If your JLG 400S lift basket has no power, try these steps:

• Check wiring for breaks, pinches, or flex damage.
• Make sure basket connections are tight and clean.
• Test fuses and the key switch.
• Look for safety switches or sensors that cut power at height.
• Try moving the boom low and high, and note where the power cuts out.

A simple multimeter check can help pinpoint whether it's the harness, basket computer, or a safety sensor.

Has anyone fixed a JLG 400S basket losing power at height? What worked for you?

 

[Robert M.]

Had something similar on a 400S before adn turned out to be a worn wire in the harness that only lost contact at full height, so definitely worth checking those flex points closely