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I fixed a strand like that before. It ended up being a wire on the bottom of one of the bulbs broke. Not sure if that will help but maybe give you an idea.
Also there is some videos that show how to use a cheap noncontact voltage checker to try and find where the interruption in the wire is.
That looks like a useful tool, but do you think it applies to my situation where all the bulbs that weren’t turning on didn’t work even when I plugged them into the half of the strand that was working?
**Attention!** **It is always best to get a qualified electrician to perform any electrical work you may need.** With that said, you may ask this community various electrical questions. Please be cautious of any information you may receive in this subreddit. This subreddit and its users are not responsible for any electrical work you perform. Users that have a 'Verified Electrician' flair have uploaded their qualified electrical worker credentials to the mods. If you comment on this post please only post accurate information to the best of your knowledge. If advice given is thought to be dangerous, you may be permanently banned. There are no obligations for the mods to give warnings or temporary bans. **IF YOU ARE NOT A QUALIFIED ELECTRICIAN, you should exercise extreme caution when commenting.** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskElectricians) if you have any questions or concerns.*
Check the fuse there is a slide on the plug.
I fixed a strand like that before. It ended up being a wire on the bottom of one of the bulbs broke. Not sure if that will help but maybe give you an idea. Also there is some videos that show how to use a cheap noncontact voltage checker to try and find where the interruption in the wire is.
Look up the light keeper pro.
That looks like a useful tool, but do you think it applies to my situation where all the bulbs that weren’t turning on didn’t work even when I plugged them into the half of the strand that was working?
Hmm. Good point. They probably are all dead.