Gasbag and others have good posts here.
Something I learned from my "big" boat days..... Wires should be fastened every 6 INCHES..... so they can't chafe. Think about that small little shielding -- and as you drive it's vibrating with every little bump.
Ditto fuel and brake lines --- fasten the damn things so they can't vibrate and crack! Stainless steel isn't very good at "vibration".
Inside that shielding is copper wire.... wiggle that a few times and see how long it goes before it breaks... then that break creates high resistance.... If I recall 8th grade shop class... a toaster is "high resistance". :>)
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