Tail light wiring diagram

1st try a different bulb, make sure its a working bulb, If the test light is blinking & u have a good ground it has to be the connection from the bulb to socket.

They are "Miny-ATO size... But you say "Tail light" is that just one ??? If that is the case than it's a bulb not a fuse...M... (EVIL ZJ)

Voltage drop test the electrical circuit .

Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Do you know what a wiring diagram is ? Do use a test light ,use a DMM - digital multi-meter . Free wiring diagram here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model . Under system click on lighting then under subsystem click on turn signal lamps . Then click the search button then the blue link . Scroll down to last diagram .

Open up the trunk, and look for any screws that would link to the tail light light, remove them, then the tail light assembly should pop off. from their remove the bulbs and install new ones, you need to know the size, check modifiedlife.com for the correct light bulb sizes.

Is fuse 29 the one you say is good? If that fuse is good, check your tail lights. If the tail lights are not working either, check the TAIL LAMP fuse in the engine compartment relay box.
There are 2 different wiring diagrams depending on if you have the amplifier or not. If you have only the basic radio, it would not have the amp. If you have a premium option, it would have the amp.
There is also another wiring color code I got from another website that's different--more like the standard colors. I'm going to include that color code as well in case you find the colors don't match the diagrams.
In the diagrams, there are actually 2 wires that run the light on the radio. One is green and one is brown with a white stripe. An aftermarket CD player will probably not have any wires for the light and just have it come on when the radio is on--day or night. So, if they connected those factory wires anywhere, that may be your problem.
I have pasted all of the relevant wiring diagrams below, though they may be hard to read because of picture size policies at FixYa. Please let me know if you have more questions.




Possible alternate color scheme:
Radio Constant Wire 12V+: Red
Radio Ignition Switched Wire 12V+: Yellow
Radio Ground Wire: Black
Radio Illumination Wire: Pink/Black
Radio Dimmer Wire: n/a
Radio Antenna Trigger Wire: n/a
Factory Amplifier Turn On Wire: n/a
Left Front Speaker Wire (+): White
Left Front Speaker Wire (-): Brown
Right Front Speaker Wire (+): Black
Right Front Speaker Wire (-): Yellow
Left Rear Speaker Wire (+): Blue
Left Rear Speaker Wire (-): Red
Right Rear Speaker Wire (+): Green
Right Rear Speaker Wire (-): Orange

Fog/Driving Light Bulb Size: 880
Here is the rest of the bulb size used in your Montana.
2000 Pontiac Montana Auto Light Bulb Diagram
Low Beam Headlight Bulb Size: 9004
High Beam Headlamp Light Bulb Size: 9004
Parking Light Bulb Size: 4157NALL
Front Turn Signal Light Bulb Size: 4157NALL
Rear Turn Signal Light Bulb Size: 3156
Tail Light Bulb Size: 3057
Stop Light Bulb Size: 3057
High Mount Stop Light Bulb Size: Assembly
Fog/Driving Light Bulb Size: 880
License Plate Light Bulb Size: 168
Back Up Light Bulb Size: 3156
Front Sidemarker Light Bulb Size: 194
Ash Tray Light Bulb Size: 558
Glove Box Light Bulb Size: 194
Map Light Bulb Size: 168
Dome Light Bulb Size: 562
Step/Courtesy Light Bulb Size: 168
Trunk/Cargo Area Light Bulb Size: 212-2
Daytime Running Light Bulb Size: 3157NALL
Thank you for using fixya.

This is the only diagram I could find for tail-lamps. The top wires are voltage, the bottom wire is ground. The brown color wire is voltage for tail lamps. The other color wire is turn or stop, depending. The turn and lower brake lites use the same bulb filament, just not at the same time. The lower brake lites are wired through turn signal switch. I don't know if diagram matches what you have? I looked at several, all showed the same thing.

Check for a short in the wiring, particularly at the bulb sockets connection.
If you have a trailer connection socket, check this also for frayed/damaged wires.
Replace any bulbs that are damaged or suspected faulty.

If you still cant find any problem, remove all bulbs on the tail light circuit - replace fuse - check that is doesn't blow.
Install bulbs one at a time - check fuse as each bulb re-installed- if fuse blows when a particular bulb installed the faulty circuit/bulb is then identified.

According to the BMW manual circuit diagram F33 feeds power through the parklight 'on' switch to left front parklight and left tail lights (all grey/violet wire).

Suggest you remove all left side parklight bulbs, then check fuse does not blow.
If it blows without bulbs installed, check wiring/lamp sockets for short to earth.

Instal one bulb at a time, checking fuse status each time.

Perhaps spurious alarm problem is related to faulty alarm wiring- especially if the alarm is an aftermarket installation. Check quality of any spliced joints to the parklight circuit for possible shorts or water ingress.

If the driver's side tail light is working, it's not a fuse. Use a test light to check for power at the bulb holder. One terminal will be for tail light, the other for brake/turn light. If the is constant power for tail light, replace bulb. If no power, trace wiring from bulb holder to driver's side junction. Probable broken wire between the two tail lights.