Traveller wont start

Check your battery cable connections thoroughly. Are they clean and tight? A loose or corroded connection can cause starting issues. Even if they look okay, it's worth double-checking.

Thanks! When you say 'thoroughly', what exactly do you mean? Like, take them completely off and clean them? And what should I use to clean them?

Yes, disconnect them. Clean any corrosion with a wire brush. Ensure they are tightened securely upon reassembly. If the problem persists after that, it's time to get it to a workshop.

Okay, just wanted to let you know, you were right! I took the battery cables off, cleaned them up real good (they were kinda nasty), and tightened everything back down. Started right up! Cost me 155€ at the workshop to have the connections cleaned and secured properly. Thanks so much for the help!