Why would my 1990 mark vii keep blowing the fuse on your factory amp and getting feed back no bare wires or lose grounds what could cause this and how do you fix the problem?

Answer 1

Fuses That "Blow" 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 in which the circuit is located.

When a fuse [and replacement fuses or Circuit Breakers] "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.

In your specific situation, another possible cause is that the AMPLIFIER draws WAY to much more current [measured in Amperes or Amps] than the conductors [wires] in the circuit are capable of safely carrying, and the fuse is just doing its job of protecting the conductors.

Since you ask this question it's obvious that you don't know enough about electricity to safely resolve this hazardous condition and for many safety issues, you ought to have a QUALIFIED automotive electrical technician troubleshoot and make the proper changes or repairs.