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Old 05-19-2003, 07:56 PM   #1
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FAQ: LED Lights, using them in tails, turn signals, etc...

What you need to use LED bulbs in your car. (also helpful for people clearing their tails)

Anything that is not a turn signal or brake light

Just install the bulb, nothing else to do. This includes, but is not limited to: interior lamps, reverse lamps, the two 194 bulbs in the headlight housing, CHMSL, etc...

Turn Signals
The issue here is that our flasher unit is thermal and you can't change it to an electronic.. So you need to use load equalizers.. Commercial versions look like this:


It is cheaper to just make your own, with the use of a 6 ohm resistor for EACH TURN SIGNAL LOCATION. i.e. one for each tail housing, one for each front lamp. A good thread on load equalizers is here

Wire colors to install load equalizer / resistor:
Drivers Rear (3156) & front turn signal (3157)
Black - Ground
Lt Blue / Black - Turn signal +

Passenger Rear (3156) & front turn signal (3157)
Black - Ground
Dark Blue - Turn signal +

Brake/Parking lights to the rear of the car
This applies to the four 3157 bulbs in the rear of the car.. two in each housing.

The pin locations are not the same for both sockets in each housing..
Explanation of why one bulb has to be modified

The APC LED bulbs for Chevy/GM will work in place of a modified Jamstrait or Sunbrite bulb. ONE bulb per tail has to be modified, read the thread above and the two listed here:

Modifying Jamstrait bulbs
Modifying Sunbrite bulbs


OTHER STUFF

GAGT.COM Light Bulb Picture Database

Bulb sizes for 99+ Grand Ams
Front:
Headlamp:9007
Turn Signal:3157
Parking light (outer turnsignal too):194/168

Rear:
Brake/Parking Lamp:3157
Turn Signal: 3156
Reverse (high): 3156
Reverse (low):912
CHMSL: 912

Complete bulb size application guide can be found at www.sylvania.com under automotive lighting.

Please add info to help

Last edited by iceman; 05-19-2003 at 07:58 PM.
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Old 05-19-2003, 08:02 PM   #2
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I forgot, info on using just plain old LEDs:

http://www.eng-tips.com/gviewthread....id/67/qid/7435

http://www.grandamgt.com/forum/showt...&highlight=LED

Read there and follow links.. good stuff.
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Old 05-22-2003, 02:45 PM   #3
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Types of bulbs that work in rear turn signals with no problems:
Recommended- 3156
Work fine with no modifications needed- 3157,3357, 3457

EDIT: I am talking about bulbs here....not LED's....I only use LED's for brake lights- not turn signals....
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Old 05-30-2003, 08:54 PM   #4
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Quote:
Originally posted by ECAP
Types of bulbs that work in rear turn signals with no problems:
Recommended- 3156
Work fine with no modifications needed- 3157,3357, 3457
i got some sunbright led 3156 and they didn't work normally, they go crazy, tried with 6ohm resistors too and still no luck, they still blink crazy
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Old 07-09-2003, 05:03 PM   #5
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Quote:
Originally posted by EBlend
i got some sunbright led 3156 and they didn't work normally, they go crazy, tried with 6ohm resistors too and still no luck, they still blink crazy
Hey I'm having the same problem...

When I put my front ones in with 6.8 ohm 10 watt resistors I didn't have any problem.

Now I'm putting the rear ones in and they won't stop blinking too fast. I tried without resistor, with a 6.8 ohm, 8.2 ohm and 22 ohm, all 10 watt and all without success. Damn hazards blink correctly though, couldn't they have made the blinkers the same way?

Any electronics guru can help us out? I've got all the wiring diagrams necessary and I can provide them on demand.

While I was looking at the diagrams I also thought of a way to do this without as many resistors. Looking at the diagram for the hazard switch wire H (the purple one) is the wire that gets the juice from (or is it to?) the flasher switch in the steering column. It might be possible to put only one resistor on the wire behind the hazard switch instead of one at each corner. All I need to know is what size resistor to use... I'm willing to test anything someone who knows what he's talking about would come up with.
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Old 07-12-2003, 07:31 AM   #6
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Alright guys, fixed my problem with the back turn signals.

I needed a LOWER resistance resistor instead of a higher resistance resistor. That's most probably because there are two bulbs on the back turn signal harness vs the front's single bulb.

Got a 5 watt/2.7 ohm resistor on each side in the back and my turn signals flash normally now.
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Old 07-14-2003, 01:08 AM   #7
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Gimli... can you tell me where too hook my resistors up to and how to do it? I'm kinda stupid when it comes to electronics...

Driver's side: Black wire and Lt. blue/black wire.
Pass. side: Black wire and dark blue wire.

I think these are the wires I'm going to be dealing with correct? Just what exactly I have to do with them is kinda foggy...
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Old 07-14-2003, 03:03 AM   #8
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You need to make it so that the resistor links the two wires without cutting these wires (you want them to still go to the bulbs).

To do so I used wire splicers (got mine at my car parts store, in the wiring section) and spliced a 6" long piece of wire on each stock wire. I then soldered each end of the resistor to one of these wires. Basically you want the resistor to bridge between the two stock wires.
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Old 07-14-2003, 07:24 AM   #9
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Sounds easy enough... do I have the wires correct though?
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Old 07-14-2003, 07:45 AM   #10
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Quote:
Originally posted by AaronGAGT
Sounds easy enough... do I have the wires correct though?
yep
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Old 07-14-2003, 09:01 AM   #11
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Can I just take my resistor and solder each end (1 into the black, 1 into the other color) or do I have to use more wire?
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Old 07-14-2003, 10:50 AM   #12
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You're better off using some more wire so that you can relocate the resistor away from anything that could possibly melt if it gets too hot.
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Old 07-14-2003, 10:56 AM   #13
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The tail light wires are accessible from inside the trunk too, if you want to keep them away from the elements... Plenty of dead space to keep them away from the carpet too.
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Old 07-14-2003, 10:57 PM   #14
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Gimli you my hero! hehe
i got 2 2.7 ohm 10 watt resistors and hooked em up! WHOLA! ITS AWSOME! FINALLY! i don't know if anyone cares, but those sunbright leds have color specific housings, which in my opinion is really ugly!!!!! so i spray painted mine silver and clear coated! now they look awsome and my tails look clear I cheaped out on turn signals, i have jamstraigh for everything else, now i am all led in front, back(including license plate and 3rd break) and my internal lights (floor lights, rear view mirror) YAY! next up for led is my led mirrors
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Old 07-24-2003, 10:41 AM   #15
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---Resistor Info---

Got my Load equalizers today and they had some interesting info I thought I'd share....

I bought 6 ohm 50 watt resistors

***Each 3157 bulbs needs its own 6ohm 50w load equalizer OR YOU CAN USE 1 3ohm 100w resistor FOR BOTH LED TURN SIGNAL BULBS***

might save ya some bucks if you order the expensive ones like I did.
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Old 08-05-2003, 07:23 PM   #16
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Thanks these directions helped a lot!!

All I have to say after running around to six autozones is f#@k APC LED's!! LOL!!

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Old 08-23-2003, 08:15 AM   #17
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what the hell. why can't this just be as easy as taking the old LED out and putting a different colored one in...sigh...
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Old 09-16-2003, 09:36 AM   #18
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Quote:
Originally posted by Gimli
Alright guys, fixed my problem with the back turn signals.

I needed a LOWER resistance resistor instead of a higher resistance resistor. That's most probably because there are two bulbs on the back turn signal harness vs the front's single bulb.

Got a 5 watt/2.7 ohm resistor on each side in the back and my turn signals flash normally now.
hey Gimli..... where did u got that resistor from? cuz i have searched everywhere and only find 2.7 Ohm resistors of 1/4 watts, .5 watts or 1 watt......but not no 5 or 10 watts......

also, when im trying to link the 2 wires w/ this resistor, does it matter what side of the resistor goes to what wire?
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Old 09-29-2003, 03:42 PM   #19
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I have read through all the jamstrait LED subjects, but still had a question. I folowed the how to guide and modified my jamstraits and put them in just how it said to, but they still aren't working properly. All 4 lights light up, but when I brake, only the 2 inside bulbs light up, the outside bulbs just stay the same. Has anyone experience this situation?
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Old 09-29-2003, 07:29 PM   #20
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You've put the modified bulbs in the wrong place I think. They go on the left-hand side of each assembly, not both on the inside or outside.

Switch your 2 outside bulbs together and it should work fine.
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