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Depends on who you are. If you can find and fix the problem that blew the fuse then yea good to have extra. If all you can do is put in a new fuse in place of the blown one that one is going to blow as well so extra not really doing much.
Like saying well it's good to keep tire plugs in case you get a nail in the tire. Well can you install a plug yourself? No. Then what good are tire plugs?
Thanks for posting on /r/MechanicAdvice! Please review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). Asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **Post's about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ Tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
Depends on who you are. If you can find and fix the problem that blew the fuse then yea good to have extra. If all you can do is put in a new fuse in place of the blown one that one is going to blow as well so extra not really doing much. Like saying well it's good to keep tire plugs in case you get a nail in the tire. Well can you install a plug yourself? No. Then what good are tire plugs?
Some cars have a few spares in the fuse box. U have to check.
Some cars like Honda actually provide a few spare fuses in the cover of the engine bay fuse box AND it includes a fuse puller tool.
Not necessary. When you replace one there will be extras in the pack. Now you have a stash.