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Old 10-08-2014, 01:46 PM   #15
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Seeing is believing
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Old 10-08-2014, 01:53 PM   #16
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And more importantly, the point which was being made WAS that a bulb that on first glance looks to be correct, can have opposite lug configuration, and thus, won't work correctly...Fleetwood in my case and many others, used 1157 quite often.
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Old 10-08-2014, 03:07 PM   #17
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Wiring Trouble

As I said before, it was a real problem that I experienced. Not speculation or a guess. The bulbs can easily be put in backwards. It happened to me. Just saying...
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Old 10-08-2014, 07:55 PM   #18
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Jonnyboy a 1154 bulb is 6 volts. unless you have a pre 1955 trailer you must use 12 volt bulbs
Maybe why that sumbitch was so bright.;o)
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Old 10-08-2014, 07:57 PM   #19
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Falcon. Been in the automotive after market for over 40 years and NEVER saw a 1157 bulb put in backwards and half of it worked.
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Old 10-08-2014, 11:23 PM   #20
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Quote:
Originally Posted by mike.t View Post
Falcon. Been in the automotive after market for over 40 years and NEVER saw a 1157 bulb put in backwards and half of it worked.
Ya got me curious. The backwards bulb with the two pins really happened, and I'd been assuming it was an 1157 bulb, but now I'm wondering if I have a different type of bulb. Incidentally, I turned the bulbs around on both tail/stop lights and the same bright dim thing happened with each of them. All the light fixtures except for the headlights are made by Hella.
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Old 10-09-2014, 11:33 AM   #21
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As far as a different bulb i don't think so Falcon. 1157 bulb is two bulbs in one base with two different circuits. The power goes through the pins on the side so they have to be at different locations or both filaments would light up at the same time.
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Old 10-12-2014, 11:08 PM   #22
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Hey guys, this isn't rocket surgery, On an 1157 bulb there are 2 filaments, each one is rated for a different wattage. the higher the wattage, the brighter the glow from the filament. there are 2 lead terminals on the bottom of the bulb and are isolated from the sidewall. The sidewall is constructed with the 2 pins out the side, each one at a different height.

12 volts positive is applied to one of the lead terminals on the bottom of the bulb, and the entire sidewall is connected to 12 volt negative and ground usually through the metal housing. One filament glows. Apply 12 volts positive to the other lead terminal on the bottom of the bulb, and the other filament glows. One bright, one dim.

Since the 2 pins are at different elevations they are keyed to insert properly, On the bottom of the socket are 2 terminals usually configured with a spring to maintain pressure and therefore good contact to the lead terminals along the bottom of the bulb.

Some cheaper socket manufacturers allow for excessive spring action, without a stop mechanism, that will permit a bulb to be inserted backwards. It will still make contact with a terminal in the bottom of the socket and the 12 volt negative along the sidewall. So the when the stop lights come on, the lights go dim and brighten when just the running lights are on.

The bulb is in backwards.
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Old 10-14-2014, 10:16 AM   #23
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Rocket surgery? Have you ever seen a socket with a 1157 bulb put in backwards?
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Old 10-14-2014, 09:20 PM   #24
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Yes

I had a motorhome that would not pass inspection because it dimmed when the brake lights were applied and the running lights were bright. Once I turned the bulb around 180 degrees, it worked properly.
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Old 10-15-2014, 10:56 AM   #25
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Then i guess i was wrong in my thinking.
Thanks
Mike
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Old 10-15-2014, 11:06 AM   #26
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The end.

Or is it..?
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Old 10-15-2014, 07:38 PM   #27
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No. I want to know why mgscott never noticed his lights dimming and running lights were getting bright when he applied the brakes.
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Old 10-16-2014, 01:48 AM   #28
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I had just aquired the Motorhome and the previous owner had changed the bulb. I assumed everything was in good working order and went straight to the Inspection station and then DMV to get tags.

When the inspector told me it failed because the brake light did not work (properly), he did give me a few minutes to work on it while he inspected another car. By the time he had finished, I had fixed it by rotating the bulb 180 degrees. The end.

Or is it?

What about the original post, Talyne - was the bulb in backwards?
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