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Author Topic: Lighting Issue  (Read 10500 times)

Offline Jay2D2

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Lighting Issue
« on: February 06, 2009, 07:26:29 am »
Ok here's a good one for you guys.

85 C10 with Quad Lights.
When the low beams are on the 2 low lights work
When you hit the high beams the 2 high lights work
However when the highs are on, only one low beam lights.
All lights are good at one time or another just not all at once.

Suggestions?
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Offline 69byrd

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Re: Lighting Issue
« Reply #1 on: February 06, 2009, 07:41:42 am »
Are you sure they are good? Reason I ask is when I put the front back on my truck, I put the lights that came off of it back on it. They had been sitting on a shelf for about 7 months, they worked good when they came off the truck but when I put them back on I had a problem similar to yours. I replaced the lights and they have worked fine ever since.
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84 C-10 Stepside       
54 Chevy Truck
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Offline Jay2D2

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Re: Lighting Issue
« Reply #2 on: February 06, 2009, 08:06:09 am »
Good for sure, he bought 2 new ones plus even switched there sides... always the same side that doesnt work.

I neglected to mention I know of 2 other local trucks that seem to have this problem
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Offline frogman68

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Re: Lighting Issue
« Reply #3 on: February 06, 2009, 10:10:44 am »
Have you verified voltage at the plug sounds like a broke wire..
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Offline Jay2D2

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Re: Lighting Issue
« Reply #4 on: February 06, 2009, 10:40:13 am »
hmm i dont think it would be a broken wire, because the low beam will light on low beam, just not on high beam
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Offline frogman68

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Re: Lighting Issue
« Reply #5 on: February 06, 2009, 10:46:04 am »
Dont have a wiring diagram with me but I think the low beam is a dual filament bulb so that when you hit the high beams the higher wattage filament lights, think its a separate wire for that.
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Offline Jay2D2

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Re: Lighting Issue
« Reply #6 on: February 06, 2009, 11:09:34 am »
going on memory the light is just a 2 prong
though i could be wrong on that
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Offline frogman68

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Re: Lighting Issue
« Reply #7 on: February 06, 2009, 11:24:12 am »
Quote from: Jay2D2 on February 06, 2009, 11:09:34 am
going on memory the light is just a 2 prong
though i could be wrong on that


 the 2 prong (H4651 / 4651) is the high beam
I am thinking that the (h4652 / 4652) is a 3 prong that is the low beam.
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Offline Jay2D2

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Re: Lighting Issue
« Reply #8 on: February 06, 2009, 11:27:13 am »
it is possible

have to go look tonight
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Offline frogman68

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Re: Lighting Issue
« Reply #9 on: February 06, 2009, 11:31:33 am »
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Offline farmallgray

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Re: Lighting Issue
« Reply #10 on: February 06, 2009, 02:41:04 pm »
The low beam bulbs have two filaments. I would say the low beam filament in one of your low beam bulbs is burned out.
You either need a 4652 (non halogen) or an H4656 (halogen) low beam replacement.

Under edit; I see you said you tried new bulbs. In that case I vote for a bad connection and keep in mind that they are a 3 prong bulb so it is possible that they light on high but not low.
« Last Edit: February 06, 2009, 02:48:02 pm by farmallgray »
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1979 K-20 350/TH400

Offline VileZambonie

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Re: Lighting Issue
« Reply #11 on: February 06, 2009, 04:06:05 pm »
The low beam is a dual filament bulb. Check your connections and or the bulb.
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