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Old 03-05-2015, 06:48 PM   #1
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1973 31' Sovereign
Tukwila , Washington
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1157 led bulb conversion

After totally removing all the interior skin on my 73 31' land yacht, I removed all the wiring re re place it and the bad connections from the factory.

I took apart the rear taillights and totally cleaned and repainted them along with new pig tails and springs

on each side there are two light housings, one is a single filament 1156 bulb which is a backup light that I've converted to an additional turn/stop
And the other is the original 1157 dual filament tail-stop/turn

My issue is that the tail light porting of the ll57 which I've exchanged for an new led type bulb, wont work when installed in the trailer. If I take the housing out of the trailer and bench test it with a battery it works fine.

I've added grounds, replace ALL the wires from the pigtail RV plug all the way through.

Everything is all new from the truck back.

Im at my wits end

the system works fine with an old school 1157 bulb

if I cut the wire that energizes the turn signal/brake wire the tail light works fine

any ideas?
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Old 03-06-2015, 12:04 PM   #2
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Can't help you but I hope someone replies, I'm interested too. Jim
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Old 03-06-2015, 12:52 PM   #3
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Sounds like you may have crossed wires to the tail lights. Not sure about older tail light fixtures, but new tail lights have three wires coming from fixture:

Red = Stop/Turn (+12 VDC)

Black = Running lights (+12 VDC)

White = Chassis ground

I'd use a voltmeter to check the voltages on your wiring. It sounds like you may have the ground wire and one of the positive wires switched.
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Old 03-10-2015, 07:08 PM   #4
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Just an afterthought: Some old travel trailers (not sure about Airstreams) use the trailer ball as the ground return for the running lights and turn signals.

Is your Airstream connected to the tow vehicle (TV)?

If not, you might try running a temporary jumper wire from the bumper of your TV to the frame of your Airstream to see if this corrects the lighting problems. If it does, the problem may go away when you hitch-up. Otherwise, you may need to verify that the chassis grounds on your TV and Airstream are connected, either through the umbilical connector, trailer ball, or a jumper wire.

Update your findings, and others may be able to suggest other things to try.
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Old 03-11-2015, 12:55 PM   #5
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Not sure if this will apply or help at all but on a utility trailer which was being converted to LED lamps we had a lot of trouble getting the lamps to light. It seems, if I recall correctly, that there was a film of some sort over the contacts where the bulb is seated into the socket. When cleaned or removed ( I don't recall which now), the problem was solved.
Other than this, grounding may be the issue.
Good luck.
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Old 03-11-2015, 02:18 PM   #6
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Also some LED 'bulbs' won't present enough load for the turn signal/brake light circuitry of the vehicle to work. The vehicle will think there is a burnout or no bulb.

Sometimes you can get load resistors or get the LED bulbs that are designed for this issue.
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Old 03-11-2015, 07:56 PM   #7
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LED bulbs are sensitive as to which wire is connected to positive or negative. It may be as simple as switching the + and - wires that feed that bulb.
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Old 03-12-2015, 01:18 PM   #8
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led

In my first tow v, I had to get a resistance extension cord to get the LED trailer lights to work. Found it on line for European type vehicles,y newest tow vehicle doesn't need it,, they fixed the resistant issues.
I suspect you have an issue related to resistance feed back.
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Old 03-27-2015, 10:25 AM   #9
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wires

Quote:
Originally Posted by jerrypike View Post
After totally removing all the interior skin on my 73 31' land yacht, I removed all the wiring re re place it and the bad connections from the factory.

I took apart the rear taillights and totally cleaned and repainted them along with new pig tails and springs

on each side there are two light housings, one is a single filament 1156 bulb which is a backup light that I've converted to an additional turn/stop
And the other is the original 1157 dual filament tail-stop/turn

My issue is that the tail light porting of the ll57 which I've exchanged for an new led type bulb, wont work when installed in the trailer. If I take the housing out of the trailer and bench test it with a battery it works fine.

I've added grounds, replace ALL the wires from the pigtail RV plug all the way through.

Everything is all new from the truck back.

Im at my wits end

the system works fine with an old school 1157 bulb

if I cut the wire that energizes the turn signal/brake wire the tail light works fine

any ideas?
I think Phoenix is on the right track.
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Old 03-27-2015, 11:00 AM   #10
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Run a direct to frame ground, yours is probably bad at the socket
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Old 03-27-2015, 11:04 AM   #11
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Use a volt meter to check volts at the socket, and switch it to continuity check for ground you should have app 12.5 with tow vehicle running at each hot connection, make sure you don't have the wires backwards, some led will not run backwards or reverse politarty
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Old 03-27-2015, 11:06 AM   #12
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Show us you completed project, in sequence of you upgrade, sound like a great idea!!!
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Old 04-06-2015, 07:13 PM   #13
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1976 31' Sovereign
Springfield , South Carolina
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When I got my rig I noted as lights failed they were all 1156 bulbs, then a week ago I noticed the outboard lights had 1157 socket so I went to town and got heavy duty 1157 long life bulbs, hooked her to the truck and checked the lights. On 4 way the outer lights would not light in that mode so I put brake on truck and engaged turn signal and went to look, still out boards would not flash.

Then I got to looking and there was a extra wire that appeared to have never been hooked up from new. Only one wire went into socket. I pulled the lens on the other side and it too appeared to have never been used which got me to thinking if separate brake lights were considered OK or was dual brake lights the desired effect.

For instance I am told my 2500 HD has a wiring harness and it is pre wired for a compass equipped rear view mirror but it did not come with one. It was explained it was cheaper to have one wiring harness for all which makes sense.

Does anyone know for sure?
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Old 04-06-2015, 07:31 PM   #14
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Some place in this thread you may already have the answer. but here goes anyway. LED flashing bulbs need a electronic flasher unit. They will not work with the standard unit.
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