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Old 05-08-2007, 06:51 PM   #1
3 Rivet Member
Wardinbb's Avatar
1964 24' Tradewind
Big Bear Lake , California
Join Date: Aug 2004
Posts: 183
Toothless Grin

Hi All,

It’s always somethin’. But we do love old trailers, don’t we! Everything’s been just ducky and I take off to go to the Stagecoach Festival in Indio, CA last weekend and the tail light LED’s are messed up! They are working, but not like they are supposed to. So I’ve come to seek the wisdom of the Forum.

Here’s what’s goin’ on:

In summary, not all the individual tail light LED’s are on.
In detail, this is what happened when connected to the tow vehicle;
Emergency Flasher: L 4 lites off at 11 o’clock, R 4 lites off at 9 o’clock
Running Lights: same as above
Running Lights w/ Left Turn signal: L same as above, R all lites on
Running Lights w/ Right Turn signal: L same as above, R all lites on
Brake Lights only: L 8 lites off at 12 o’clock, R 4 lites off at 9 o’clock
Running Lights w/ Brake Lights: L 12 lites off at 10-12 o’clock, R 6 lites off at 9 o’clock and 4 lites off at 1 o’clock !
Second test Brake Lights only: L 16 lites off at 9-3 o’clock, R 12 lites off at 12-3 o’clock!

While working the brake lights, I’m hearing a humming wine !? I found the noise at the left electric brake drum with the brake lights on.

So maybe, the drum brake is shot and effecting the tail lights? Or are the defunct LED’s effecting the brake ?
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Old 05-08-2007, 09:47 PM   #2
Rivet Master

2005 25' Safari
Salem , Oregon
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Hi, I will give you two choices; One the voltage is out of range, too low or too high. [ check trailer to tow vehicle ground connection too] Or the lights are just bad and need to be replaced. I have one on my trailer that, at times, the brake light part won't work. I bought new lights.


2005 Safari 25-B
"Le Petit Chateau Argent"
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Old 05-09-2007, 06:24 AM   #3
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1994 36' Classic 36
North Charleston , South Carolina
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Posts: 1,681
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Humming brakes

Humming is a good thing. Hopefully, all of your wheels hum. (When brakes are applied that is........)

That is the music of functioning electro-magnetic brakes.
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Old 05-09-2007, 09:30 AM   #4
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1978 31' Excella 500
Venice , California
Join Date: May 2006
Posts: 1,063
L.E.D.s are voltage sensitive. Ideally, we put overvoltage protection in when we install them. Don't we? No? Proabably should. Transient voltage surges from back EMF (brake magnets, for exammple)sometimes get into the circuits that have L.E.D.s and knock them out. Looks like that happened to you. The old Univolts can do it if they get out of range too. When mine died it went up to 18 volts. There are little three prong voltage stabilizers (solid state) that you can add to L.E.D.devices. One side goes to ground , one side to supply,and the output to your device. they're used in automotive instrument clusters, etc. RadioShack item.
"Not all who are laundering are washed" say Bill & Heidi

'78 Excella 500,"The Silver Pullit". vacuum over hydraulic disc brakes, center bath, rear twin. '67 Travelall 1200 B 4X4 WBCCI 3737
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Old 05-09-2007, 12:21 PM   #5
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1964 24' Tradewind
Big Bear Lake , California
Join Date: Aug 2004
Posts: 183
Checkin' It Out

Thank you Guys for your input.
The LEDs are new and worked fine since installation of a year or so ago. I'm hard pressed to accept that the lights are broke and just in denial at this juncture. There really isn't much more than 40-50 hours of use on those taillights. I'd suspect the grounds first and will start there. The wheels need to be pulled anyway to check the brake pads and repack the bearings if need be.
The only thing that comes to mind is our recent cold winter, thats been the only change around here. It's also puzzling that the right light operated at 100% with the turn signal on, but didn't do the same thing twice. I recon' its a wire thing some where. I also have a new IntelliPower that also seems to be just fine with whatever it needs to do.
I'll keep looking and let ya know.
Thanks again,
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