Home » Public Forums » GMCnet » [GMCnet] Will 1157 LED Bulbs work with our turn signal flasher
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| Re: [GMCnet] Will 1157 LED Bulbs work with our turn signal flasher [message #297946 is a reply to message #297942] |
Wed, 23 March 2016 22:21   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Nope. I successfully replaced the rear stop/turn bulbs with LED's, but
when I installed them in the park/turn sockets, the turn signals stopped
flashing. The LED's don't draw enough current to activate the bimetallic
flashers in the GMC. You can put a resistor across the LED to increase the
current flow, but if you're going to do that, why not just keep the
resistors (bulbs) that are already in there? ('Though I do have a scorched
parking light lense that would not have been damaged by LED's.)
Ken H.
On Wed, Mar 23, 2016 at 11:08 PM, Bob Dunahugh wrote:
> It's another case of my having everything apart. Might as well change the
> bulbs. Bob Dunahugh78 Royale
> _______________________________________________
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Will 1157 LED Bulbs work with our turn signal flasher [message #297947 is a reply to message #297942] |
Wed, 23 March 2016 22:30 |
cbryan
Messages: 451
Registered: May 2012
Location: Ennis, Texas
Karma: 3
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Bob,
Conventional wisdom says to add a resistor in parallel with the bulbs. My experience of 5 years ago trying to replace the 1157 bulbs in daughter's car was that the replacements looked anemic and actually dangerous. Manufacturer said that white LED lights would be better, but I decided to wait. Perhaps get an electronic flasher, potentially more reliable. Check out the brightness A to B comparison. I am sure they have improved. With the increased efficiency, we should be able to get more brightness with less current draw, less voltage drop in the wiring, and with LED, quicker to be bright since no filament to warm up. With our setups and no high mount third brake light, I am interested to get extra bright brake lights. I think the best solution I saw here was getting that Tractor Supply (or was it Harbor Fright?)kit sold for trailers and cut it down. It turns out to be a matrix of red LED bulbs and is very bright. Did Dan Gregg have some on his coach? There's one illustrated on the photo site. Very dramatic photos of brightness. JP Benson had a series of pictures at the photo archive (bdub.net) of Harbor Freight LED bulbs put into the GMC tail lights. He reported much brighter lights. Sorry to not have a simple answer, but good luck with your finishing up the coach.
Carey
Carey from Ennis, Texas
78 Royale, 500 Cadillac, Rance Baxter EFI.
[Updated on: Wed, 23 March 2016 23:40] Report message to a moderator |
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| Re: [GMCnet] Will 1157 LED Bulbs work with our turn signal flasher [message #297948 is a reply to message #297946] |
Wed, 23 March 2016 22:31 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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These work well.
http://m.ebay.com/sch/i.html?_nkw=led+turn+signal+flasher
Dolph Santorine
DE N8JPC
Wheeling, West Virginia
1977 ex-Palm Beach TZE167V100820
1-ton, Sullybuilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010,
> On Mar 23, 2016, at 11:21 PM, Ken Henderson wrote:
>
> Nope. I successfully replaced the rear stop/turn bulbs with LED's, but
> when I installed them in the park/turn sockets, the turn signals stopped
> flashing. The LED's don't draw enough current to activate the bimetallic
> flashers in the GMC. You can put a resistor across the LED to increase the
> current flow, but if you're going to do that, why not just keep the
> resistors (bulbs) that are already in there? ('Though I do have a scorched
> parking light lense that would not have been damaged by LED's.)
>
> Ken H.
>
>
>> On Wed, Mar 23, 2016 at 11:08 PM, Bob Dunahugh wrote:
>>
>> It's another case of my having everything apart. Might as well change the
>> bulbs. Bob Dunahugh78 Royale
>> _______________________________________________
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Will 1157 LED Bulbs work with our turn signal flasher [message #297955 is a reply to message #297942] |
Thu, 24 March 2016 07:30 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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I know if you put light emitting diodes in the front turn signals you mess up the whole wiring setup of how the front side markers are wired into both positives on the turn/parking light that makes it alternate on/off with the turn signal. Just for those that don't know, a diode is basically an electronic check valve and it messes with the ground circuit for the marker light. Just my experiences and observations.
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: [GMCnet] Will 1157 LED Bulbs work with our turn signal flasher [message #297962 is a reply to message #297942] |
Thu, 24 March 2016 09:26 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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When I go to LED stop/turn/park lights, I'll replace the flasher with one of the little timers I bought, and use the relay contacts. This will give the same effect as the bi-metal flasher unit, except that it will be independent of current draw.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Will 1157 LED Bulbs work with our turn signal flasher [message #298085 is a reply to message #298080] |
Sat, 26 March 2016 09:04 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Gatsbys' Cruiser wrote on Sat, 26 March 2016 02:58I was told once upon a time that there are two types of flashers made. The stock flasher uses the bulb resistance to time the flashes, that is why when a bulb is burnt out, the flash id different , really slow as I recall. The SECOND type of flasher is the HEAVY DUTY type like what would be used when towing a trailer. It has an internal resistance that does not use the bulb resistance to make the flasher work. When a bulb burns out, the flasher works the same speed because of the internal resistor.
going by that thought, I would think the LED lamp would have no bearing on how the flasher works...
OK Stan,
You are close, but you are missing just a little.
You are completely correct about standard flashers. In Fact, that series resistance is why there are different 2 & 3 bulb flashers. This was actually done on purpose so a driver would know if a signal bulb was out. I didn't say that most drivers would care.....
Problem: With the lower current of an LED, they may not even know that there is even a bulb there.
The heavy duty or constant load flashers still use the bulb filaments, but only as a ground path for the heater on the bi-metal flasher. With incandescent bulbs, even one is enough to make the heater work, but LEDs are such low current that they don't even come close to heating the flasher. Some constant load flashers will work with only one incandescent bulb and others will not.
Then there were the European cars that wanted to indicate a bulb out and still flash the remaining. So, at considerable expense they included a current sensing relay. These don't flash the panel indicator when a bulb is out or it has been changed to an LED.....
OK, back to the coffee.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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