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My 89 mustang gt headlight's are running off the battery

When I turn the switch there is no action.I tested wires the switch work's on it's funtion's power is threw the green wire only.no hi beam action

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  • 78 Answers

Usually the high /low dimmer switch on the column goes bad or a headlight relay, headlight switch supplies power to the dimmer switch.

Posted on May 16, 2017

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2000 ford mustang gt Turn on key and no power, no


if its a handchiffted gearbox put in highest gear.
puch the car to the front and back till you hear a click.
if he starts .check the ignition.if this is not correct the car have a death spot.

Oct 18, 2013 | 2000 Ford Mustang

2 Answers

99 mustang won't start it only do 1 click. If it


Battery good, cables good, all connections clean and tight, no corrosion on battery terminals?
Try to determine if click is from solenoid on the starter or starter relay. Turn the headlights on and watch them while someone turns the key to start. If they get dim, probably the starter-have it tested-even new ones are sometimes bad. If lights don't dim, you will need to check the start circuit. Check for power on the small wire to starter solenoid when key is held in start. If no power there, work back towards the ignition switch. Check the neutral safety switch-should have power in and power out when key held in crank. The ignition switch will have a start wire out of the switch going to the neutral safety switch. It should have power with key in start, the only time the start wire will have power.
Post back with what you find-good luck.

Sep 25, 2013 | Ford Mustang Cars & Trucks

1 Answer

89 LX support Mustang dim headlights changed headlight switch check the wires connections all good and clean grounds are good.


You have a poor ground somewhere, likely near the headlight connector. Run a new ground to the connector, check the B+ voltage to the connector is it the same as battery voltage?

Aug 29, 2013 | Ford Cars & Trucks

1 Answer

2003 mustang gt drains battery in 2 days


03 Mustang GT (Parasitic) Battery Drain Fix
welcome.gif
Hello,
I am seeing a lot of mustangs are having battery draining issues and I wish to share some simple solutions found while working on a friends 03 GT 4.6ltr.

In a quiet area, key switched off, hood up, Listen carefully close to alternator. I heard a high pitched hissing/whistle sound at low volume, came from back of alternator. This sound was the voltage regulator/rectifier staying on when key is off due to faulty diodes inside the voltage regulator/rectifier circuit, can cause battery to go dead after car not ran in about 2-7 days.

After having the alternator tested free at a parts store, test showed alternator was good because the faulty diodes in the alternator did not show up on the test, the machine did not test for faulty drain back issues that were present.
Alternator on-car-fix:

There was battery voltage running at all times through the two-wire connector on back of alternator. Disconnect the battery first for safety and to reduce chance of short circuit. The yellow wire/with white stripe is hot while car is off so I traced this from the 2-wire connector on the alternator then closer towards driver side front fender. Next I cut the Yellow/White Stripe wire, spliced a good connection wire to it and ran it through a hole in the fire-wall to the fusebox(under dash), connected it to a 15a fuse that does not get used but has power when key is turned on but no power when key is off.

The purpose for re-routing the hot wire to the alternator, is to turn off the alternator charging circuit when the key is turned off so it may not run down the battery. I am seeing good results with this fix(or patch) so far. No More Parasitic Battery Drain!

Another fix can be to change the small pulley on the alternator to a larger pulley so the alternator does not spin too fast, putting too much energy through the diodes can cause a charging system to act a fool. So if you have charging issues and have an alternator changed, putting a larger pulley on can make sense turn into saved dollars(especially on high revving engines).

I hope this info helps to solve some draining battery and/or alternator issues.

thanks.gif for reading,

TyBorg1

Apr 12, 2012 | 2003 Ford Mustang

1 Answer

My headlights won't come on. I replaced the headlight switch about a month ago. I went to Autozone to see if another switch would work and it didn't. What could I do to fix the problem. I have a 1991 Ford...


Did you check the wiring when you replace the switch? Some times the plug that you plug into the light will be melted or burnt. I know cause I had 2 - 5.0 stangs and both did the samething. Is the car equip with fog lights? If so I would disconnect them. I found that the fog lights on my 89 gt cause the head light switch to over heat and melt. On both I had to repair the wiring at the plug.

Oct 30, 2009 | 1991 Ford Mustang

2 Answers

On my 1996 Mustang GT, when I turn on my headlights, my dashboard lights go out. Is that a fuse, ground or some other issue?


The proposed problem sounds like the problem I had with a 95 Mustang. Check the tail lights as well as the dash lights. If both are out when the headlights are switched on, the problem more than likely is with the headlight switch. The 95 had a poorly designed wire and plug configuration going into the switch. The wiring was too small and the plug would literally melt. The headlight switch and plug has to be replaced in this case. The problem was supposed to have been cleared with the 96 Mustang; however, a persistent problem may suggest checking the plug/switch combination.

Aug 29, 2009 | Ford Mustang Cars & Trucks

2 Answers

How do you stop / turn off an 89 Mustang chime / buzzer?


If You Are Talking About The Door Chime There Are Two Ways To Do It One Is To Simply Unplug the Chime Two Is To Remove The Steering Columm cover and Unplug the black wire that is going to the side of the key switch I would Recommend This Method Because Unpluging The Chime Its Self Will Disable the Headlight on Switch off Warning As Well Removing The wire From Switch on column will disable key in switch door open only

Aug 17, 2009 | 1989 Ford Mustang

1 Answer

I AM INSTALLING A TACHOMETER IN MY 89 MUSTANG GT AND I DONT KNOW WHICH WIRE TO USE ON THE DIMMER SWITCH FOR THE TACH LIGHT?


Grab a $5 12volt test light & probe back of switch where wiring comes into switch, for wire that has power when you pull lights on. If that's when you want it illuminated. If you want it too go bright or dim with dash , poke wires until you find that one, while turning switch to bright dim, and test light will do same.

Jul 05, 2009 | 1989 Ford Mustang

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