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Taillight Issue
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Das67bus
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PostPosted: Fri Nov 14, 2025 5:02 pm    Post subject: Taillight Issue Reply with quote

To the electrical gurus out there.

I have a '67 Panel Van. When I turn on the lights, the taillights do not come on. If I turn the lights off and then on again, the taillights come on.

Any ideas why it would do this?

Thank you VERY much in advance! Thumbs Up
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70bus Premium Member
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PostPosted: Fri Nov 14, 2025 6:33 pm    Post subject: Re: Taillight Issue Reply with quote

Disconnect battery
remove light switch
clean light switch internals
install light switch
connect battery
pull switch once
hopefully all good!

if not
buy new light switch
(actually you can often rebuild them; details in tech section)
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Eric&Barb
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PostPosted: Fri Nov 14, 2025 8:18 pm    Post subject: Re: Taillight Issue Reply with quote

Das67bus wrote:
When I turn on the lights, the taillights do not come on. If I turn the lights off and then on again, the taillights come on.


Which lights?? Headlights or just the running lights? Are you pushing on the brakes?

Have you installed ground wires from each taillight to the battery ground strap bolting point on the body??
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@Buswerx
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PostPosted: Fri Nov 14, 2025 10:52 pm    Post subject: Re: Taillight Issue Reply with quote

I would check grounds. A bad ground could make the lighting intermittent.
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Bobs67vwagen
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PostPosted: Sat Nov 15, 2025 5:09 am    Post subject: Re: Taillight Issue Reply with quote

On the early buses I owned in the past I would run separate ground wires from each t/l housing to the body, to be assured that I had a good ground on each.
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Das67bus
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PostPosted: Sat Nov 15, 2025 7:42 am    Post subject: Re: Taillight Issue Reply with quote

Eric&Barb wrote:


Headlights turned on, switch pulled all the way out. Not pushing on the brakes.

Each t/l has a ground wire running to the brackets on each side of the engine compartment door. I will check the ground to make sure they are clean/solid. If running to the battery ground strap is better, I can do that too.

Thanks!!
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Das67bus
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PostPosted: Sat Nov 15, 2025 7:44 am    Post subject: Re: Taillight Issue Reply with quote

@Buswerx wrote:
I would check grounds. A bad ground could make the lighting intermittent.


Will do. Thanks!!
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Das67bus
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PostPosted: Sat Nov 15, 2025 7:45 am    Post subject: Re: Taillight Issue Reply with quote

Bobs67vwagen wrote:
On the early buses I owned in the past I would run separate ground wires from each t/l housing to the body, to be assured that I had a good ground on each.


Good point, each t/l ground is run to the body.

Thanks!!
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Eric&Barb
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PostPosted: Sat Nov 15, 2025 10:57 am    Post subject: Re: Taillight Issue Reply with quote

Das67bus wrote:

Each t/l has a ground wire running to the brackets on each side of the engine compartment door. I will check the ground to make sure they are clean/solid. If running to the battery ground strap is better, I can do that too.

Thanks!!


Better in that anytime you clean the battery strap point you can also clean the ground connections to the taillights. So a three for one job. Adding a little dielectric grease to seal out water and oxygen will keep the corrosion from getting back in there for many more years.
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BarryL Premium Member
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PostPosted: Sat Nov 15, 2025 6:45 pm    Post subject: Re: Taillight Issue Reply with quote

Das67bus wrote:
If I turn the lights off and then on again, the taillights come on.


I would run an alligator wire jumper from #30 to #58 on the headlight switch and see if every time you touched it the taillights went on. If so then get a new headlight switch.
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Das67bus
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PostPosted: Sun Nov 16, 2025 8:55 am    Post subject: Re: Taillight Issue Reply with quote

Eric&Barb wrote:
Das67bus wrote:

Each t/l has a ground wire running to the brackets on each side of the engine compartment door. I will check the ground to make sure they are clean/solid. If running to the battery ground strap is better, I can do that too.

Thanks!!


Better in that anytime you clean the battery strap point you can also clean the ground connections to the taillights. So a three for one job. Adding a little dielectric grease to seal out water and oxygen will keep the corrosion from getting back in there for many more years.


Makes sense!! Thank you!
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Das67bus
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PostPosted: Sun Nov 16, 2025 8:56 am    Post subject: Re: Taillight Issue Reply with quote

BarryL wrote:
Das67bus wrote:
If I turn the lights off and then on again, the taillights come on.


I would run an alligator wire jumper from #30 to #58 on the headlight switch and see if every time you touched it the taillights went on. If so then get a new headlight switch.


Thank you, I'll give it a shot! Thumbs Up
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Eric&Barb
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PostPosted: Sun Nov 16, 2025 10:14 am    Post subject: Re: Taillight Issue Reply with quote

Das67bus wrote:
BarryL wrote:
Das67bus wrote:
If I turn the lights off and then on again, the taillights come on.


I would run an alligator wire jumper from #30 to #58 on the headlight switch and see if every time you touched it the taillights went on. If so then get a new headlight switch.


Thank you, I'll give it a shot! Thumbs Up


If you do pull out the headlight switch, do post an image of it. Could be it can be repaired.
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BonTonRoulet
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PostPosted: Sun Nov 16, 2025 9:09 pm    Post subject: Re: Taillight Issue Reply with quote

The original VW taillight housings had a small raised pointed nub cast into them near either the upper or lower mounting machine screw for the lense to pull the assembly tight to the body to make the ground. It never did work well.

60 years later I like to create my own ground wiring loom for both taillights and the license plate light in one installable piece that turns out nice and functions like it should.

Start out with a length of trying to think it's 16 or 17 gauge copper wire preferably coated in brown or black as a proper ground wire would be, and start by soldering a large ring terminal on the end of your wire. I despise crimp on connector stuff so let's avoid that future hassle and build this on the work bench. No you'll need your new main ground wire we shall call it to be able to be mounted via the ring terminal to the bolt holding the battery main ground wire to the triangular gussett plate at engine hatch. So let's just fit it all together here.....put the ring terminal where it needs to go at the bolt come towards the rear of the bus with the wire then slip the wire between the chassis of the bus and the engine lid rubber seal, let's move up towards the corner of the engine lid and make a mark on the wire where we want to branch off with a stub ground wire a few inches to a small ring terminal we'll take a #2 sheet metal screw and zip it into the back of the tailight housing a; then continue our main ground wire under the seal across the top of the engine compartment where near the center we'll make another short stub to ground the license plate light, we'll continue our main across and down to the other tailight assembly for our final small ring terminal we'll zip into the back of the tailight with a #2 sheet metal screw to finish the job.

We'll build it all up with solder and heat shrink tubing at the connections and it all hides behind the engine lid seal and should be trouble free for the next 60 years. Much better than VW did originally!

You'll be proud of your work and have a good reliable ground wire set up on probably the most important part of your vintage bus to make reliable as we just recently lost one of our traveling companions to a horrific rear end night time crash.

Good Luck!
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Das67bus
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PostPosted: Mon Nov 17, 2025 6:13 am    Post subject: Re: Taillight Issue Reply with quote

BonTonRoulet wrote:
The original VW taillight housings had a small raised pointed nub cast into them near either the upper or lower mounting machine screw for the lense to pull the assembly tight to the body to make the ground. It never did work well.

You'll be proud of your work and have a good reliable ground wire set up on probably the most important part of your vintage bus to make reliable as we just recently lost one of our traveling companions to a horrific rear end night time crash.

Good Luck!


Thank you! Great advice and directions!!

Laissez les bons temps rouler!
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Eric&Barb
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PostPosted: Mon Nov 17, 2025 11:55 am    Post subject: Re: Taillight Issue Reply with quote

BonTonRoulet wrote:
we'll continue our main across and down to the other tailight assembly for our final small ring terminal we'll zip into the back of the tailight with a #2 sheet metal screw to finish the job.


The only thing we will disagree with this is that the sheet metal tube that is flanged into the taillight reflector is another place that corrosion will get into which causes another voltage drop. VW finally dealt with this with the 1970 & 71 bus taillights when they first installed ground wires for the taillights from the factory. They not only added a ground electrical terminal, and another piece of brass to be spring loaded against that tube that the bulb resides in. Which between the two pieces of brass is another place to cause a corroded connection. The below image shows these connections, but is missing the bulb tube.

Image may have been reduced in size. Click image to view fullscreen.


Personally for the 1970-71 taillights just solder a short wire soldered from the brass clip to the tube the bulb is in will do the trick to removing these last few ground connections there. You will need a very hot bigger soldering iron for this.

For the 1962-1970 taillights have soldered brass slip on terminal to each reflector and solder the short wire from brass tab to the bulb tube. Brass while it does corrode, does not do this as badly or quickly as the steel of the bulb reflector.

If you have a burnt out sealed beam headlight bulb, de-solder the brass tabs of of it. Those tabs are a bit wider than the regular size of connectors in the VWs, but a few minutes of filing can make those fit the narrower connector.

Yes, for the Euro 1962-71 and the standard 1958-62 small round taillights that are cast pot metal, will drill, install two nuts with a bolt (brass or SS fasteners), and the brass terminal tab. Have yet to try a pot metal solder for this setup yet, those are out there, but rather nasty chemistry.

Prefer the brass tabs instead of the ring terminals due to when pulling a taillight it is a quick slip off, and when cleaning that ground someday it again is an easy slip off to do that.
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crofty
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PostPosted: Mon Nov 17, 2025 3:31 pm    Post subject: Re: Taillight Issue Reply with quote

Can you adjust the brightness of the dash lights?
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