[ARCHIVED THREAD] - tail lights help

Posted: 8/9/2007 12:58:43 PM EDT

A little help guys, please
I have a 91 f150 and the tail lights are out.
The blinkers work and the hazzards work.
I changed the bulbs, flasher, and the head light swich.
Where else do I need to look to fix these?

Posted: 8/9/2007 1:25:07 PM EDT

[#1]

Fuse?

If you take the bulb out , did you use a test light or MM to check for current/volts to that socket?

Posted: 8/9/2007 1:26:00 PM EDT

[#2]

all the fuses are ok

Posted: 8/9/2007 1:30:06 PM EDT

[#3]

I have a meter but I don't know what setting to put
it on to test the sockets, anyone.

Posted: 8/9/2007 1:31:39 PM EDT

[#4]

ETA:

Nevermind. Reading is fundamental.

Posted: 8/9/2007 3:32:35 PM EDT

[#5]

Quoted:
I have a meter but I don't know what setting to put
it on to test the sockets, anyone.

Set the meter to a 20 volt DC scale or something close to that. Check for 12 Volts -with lights on- on the BROWN wire of the light socket.

Black wire is your ground.

Posted: 8/9/2007 5:35:20 PM EDT

[#6]

When you say the tail lights dont work, do you mean when you turn on you headlights the tail lights dont work, or that your BRAKE lights dont work?

If brake lights try a stop light switch.

Posted: 8/9/2007 5:35:31 PM EDT

[#7]

Went back and checked the power wire, had
power when grounded to the frame , but with the
ground wire nothing. Bad ground wire make sence?

Posted: 8/9/2007 11:34:06 PM EDT

[#8]

If your bed is rusty, the ground maybe be interupted. Sounds like you figured that out, so add a new wire with a better connection from the bed to the frame. Then see if it works.

Posted: 8/10/2007 4:26:40 AM EDT

[#9]

The best way to check a ground is to connect one lead of your meter -or clip the test light- to a good 12 Volt power source. Then probe the ground wire with the other lead of meter or test light.

The battery positive terminal is a great 12 volt power choice if you can reach that far. If using battery pos terminal and a meter, first check battery voltage between the two battery posts. You should read 12.4-12.7 volts.

Using battery + term. for a power source you should have battery voltage on the ground wire, (with a .3-.4 acceptable loss of voltage) and still be considered good. If you lost .5 volts or more from battery voltage then you have a bad -or weak- ground.

If using a test light and it lights up bright you have a good ground. If it's not very bright you have a weak ground, if it doesn't light up at all you have a bad ground or broken ground wire.

Repair ground wire as necessary.

Posted: 8/10/2007 11:49:01 AM EDT

[#10]

I=E/R

[ARCHIVED THREAD] - tail lights help

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[ARCHIVED THREAD] - tail lights help

[ARCHIVED THREAD] - tail lights help