answersLogoWhite
Ask
Car Fuses and Wiring
Ford Ranger XL
Late Model 1979-New Ford Mustangs

Why does a fuse blow everytime the headlights are turned on while playing the stereo in a 1990 Ford Mustang LX?

242526
Answer

Top Answer
User Avatar
Wiki User
2005-04-22 23:38:29
2005-04-22 23:38:29

You have grounded to the radio light wire, not the ground. It is a negative wire that is in the harness, and when you turn on headlights you blow the dash lights. Remove your radio ground from the car, and find a new ground. It should be a large black and green wire (larger than all the others). replace the fuse, and turn on the lights...you will see your old ground wire is actually hot now. Common mistake, and it tests like ground wire with lights OFF, but not on. Relentless

1
0

Related Questions

User Avatar

Car stereo wiring color codes for a Mustang can be seen on a diagram. The diagram may be found in an owner manual or request from the stereo company.

User Avatar

Illumination is the ability to lighten the screen or darken the screen with the other dash lights on the vehicle. normally you will have two orange wires coming from the cars wiring harness one with a white stripe one without. The orange/white wire will make the stereo dim or brighten with the dash lights. the solid orange wire will dim/brighten the stereo with the headlights. so if it is night you will have the headlights on, when you turn the headlights on the stereo dims so the light from the stereo will not blind you at night. while the headlights are off the stereo will be bright so the stereo light will be visible in the daytime

User Avatar

The headlights turn off because you have accidently hooked the stereo's power wire onto the headlight relay wire. When you turn on the stereo, there's not enough power left to run the headlight relay. Thus, no headlights. Re-wire the stereo.

User Avatar

It is important to know what is going on inside of a vehicle. The headlights dim when a stereo is turned on or turned up because power is being drawn away from the lights to the stereo.

User Avatar

Motorz - 2010 Mustang Stereo 1-11 was released on: USA: 18 April 2010


Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.