Why does my 1999 Yukon keep blowing the brake and tail lights out?

Answer 1

Fuses That "Blow" Repeatedly

Your question is unclear as to whether you mean that the fuse keeps blowing, OR the light filaments are burning out. I am going to assume that you are talking about replacement fuses that blow out repeatedly.

Fuses [and Circuit Breakers] are safety devices designed and installed in electrical circuits TO PROTECT the conductors [wires] from short circuits and overload conditions which can cause extreme overheating that can result in damage to the insulation and the conductors, and worse, the possibility of a FIRE which could destroy the vehicle, house, or other structure.

When a fuse and replacement fuses blow, especially if it happens repeatedly, is an indication of an UNSAFE CONDITION in that circuit, usually a short.

The proper "fix" is for a qualified technician, who knows what he/she is doing, to troubleshoot the circuit, find and identify the defect, and make proper repair [s], BEFORE replacing the fuse again [with the properly sized fuse or circuit breaker]. Some ignorant few will suggest installing a larger fuse or breaker to solve the problem, BUT that will only amplify the problem, not solve it.

Do not follow "bad" advice and install a larger fuse in a misguided attempt to correct the problem. To install a larger fuse would almost guarantee damage to the wiring and an electrical system fire.