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Old 10-19-2012, 01:30 PM   #15
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Time to update this thread and ask some more questions..

Further to my tail lamp issue, I figured out why the upper marker lamps would not work when I put the LED's in
They are made by Grote...
Her is a view of the internals... complete with incandecent bulbs.



I already mounted the rear ones, and if you notice the Ground connection is handled by the tab under the mounting screw...
The Incandecents worked great, but when I swapped in the the LED bulbs, they would not work.. so I swapped the incandecents back in.

Now I have the front markers on the bench and wanted to figure it out.

Connected the body to a ground, and the wire to +.
The Incandecents worked fine.
Put in an LED, on one side... Nada... Nothing, but Incandecent was working fine.
Now, I know that LED's are polarity sensative, so I swapped the connection... Body of lamp + and wire ground..
Worked great..


Now, I looked closely at the fixture..


Note... the gold colored metal is connected to the single wire... so should be +... yet its the body of the bulb...
And the silver colored metal that has the the screw tab... that would be ground is connected to the center post of the bulb...


What is up with that?
I always thought the center pin is + and the body is grounded....
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Old 10-19-2012, 01:54 PM   #16
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Yours are different than my setup. When I replaced all my running lights and brake and backup lights with leds I used a wedge type bulb.So I did not have a issue with pos or neg .
Jim
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Old 10-19-2012, 04:13 PM   #17
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I was always under the impression that the center pin on bulbs like these was +... am I wrong?
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Old 10-19-2012, 05:37 PM   #18
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It doesn't make a difference for tungsten bulbs-they're not sensitive to polarization. If you convert to led bulbs, you would need to change the fixtures or modify the ones you currently have.
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Old 10-20-2012, 08:55 AM   #19
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LED lights are "light emitting diodes".

A diode is like a check valve, in that it allows something to flow in one direction, ONLY.

Therefore all LED lights "are indeed" polarity sensitive.

Andy
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Old 10-20-2012, 09:44 AM   #20
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You said "Swapping the stock 1157 incandecent bulb back in and all is normal again...
" there for, the problem is in the LED bulb. Check the contacts on the LED bulb. There is where you will find the problem, not in yout MH.
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Old 10-21-2012, 03:24 PM   #21
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I have not had time to get back into the tail lamp issue yet...

I agree with you Andy, and am aware that LED's are polarity sensitive.
My question was that it had been my experience that the center pin/pins on bulbs was normally the +... and these marker lamp fixtures were not like that.

So here is my protype solution... to convert the lamp to + on the center pin.
I removed the ground strap(silver) contact and cut it off within the recessed area.
I then drilled thru the center and inserted a bolt...
Pic of modified lamp and original front and back.



The red wire will now supply + power to teh bulb pin, and the original black wire will be ground.
I need to do some detail work on the bolt, nut and connection yet to make sure they are good and safe, but I think this will work.
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Old 10-21-2012, 03:58 PM   #22
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Your solution will work. What the reasoning behind the original manufacture making the fixtures with reversed polarity was is hard to say. Yes they would work with normal bulbs but it was just against conventional standards.
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Old 10-21-2012, 04:04 PM   #23
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Thanks Howie,
Yes, I just find it odd too.
There is plenty of space behind the lamp inside the casting to be sure the + power will not contact the ground, but I still worry.. I am gonna see if there is better connector or solution before I do them all. Took me all of 3 mins to make this change.

As soon as I have modded all of the marker lamps, I will be going back into the LED tail lamp issue!
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Old 10-21-2012, 05:13 PM   #24
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I believe it may be far easier AND cost effective to check out LED marker light assemblies at a trucker's supply place...

Find the kind with a similar 'footprint' to your old units...

I replaced all the marker lights with new LEd units - simply removed the old ones, attached POS wire to new units, gooped with sealant and reattached...worked great and still going strong after almost 5 years...
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Old 10-21-2012, 06:07 PM   #25
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Quote:
Originally Posted by Keyair View Post
There is plenty of space behind the lamp inside the casting to be sure the + power will not contact the ground, but I still worry..!
Except the three center rear ones mount directly to the skin, at least on my MH. Most new markers lights have very little space on the back side to accommodate the wire...
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Old 10-21-2012, 07:32 PM   #26
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You are right Peter... my mod will not work on the center 3 lights on the rear... they are right on the skin, so no space.
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