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Troubleshooting Key That Wont Turn for Red Master Lock Trailer Coupler Lock

Question:

Key won’t turn on master lock “red” ball lock

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Expert Reply:

If you are having trouble unlocking the Master Lock Trailer Coupler Lock # ML389DAT then I recommend using a spray lubricant like WD-40 to help loosen up any dirt or grime that may have gotten in the lock. Let the spray sit in the lock for a few minutes and then try operating it again. If this still doesn't fix the problem then you may need to have a locksmith take a look at it.

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Jon G

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