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Topic: Stupid electrical question

in Forum: C3 Electrical


Stupid electrical question

Posted: 6/29/05 9:11pm Message 1 of 13
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Scott, LA - USA
Joined: 2/26/2004
Posts: 303
Vette(s): 77 L82 coupe
Hi all have a couple questions for ya.
1. Does anyone know the wiring setup on the rear window defoger (color wires routing etc)?
2. The front side blinkers (in front of the wheel) are those 12volt or have they been stepped down to sic some how?
Thanx
Glenn








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Stupid electrical question

Posted: 6/29/05 9:21pm Message 2 of 13
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Don't have the info on the rear w/defog, but all the bulbs on the car are 12v. Some are just different "candlepower"(brightness), but 12v.


Joel Adams
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Stupid electrical question

Posted: 7/6/05 1:12pm Message 3 of 13
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

The front side marker bulbs are 12 V.  Bulb number either 168 or 194.  The 194 is a touch brighter.

One side of the bulb connects to the turn signal.  The other bulb contacts connects to the park light.  (No Really)

When the park light is turned on, the side bulb becomes hot, and grounds through the turn signal, and stays on steady.

When the turn signal is on, the bulb grounds through the park lights. It now blinks with the turn signal.

When BOTH park and turn signal are on, the side bulb has a hot lead on each side, so it does not light.  When the turn signal goes out, it comes on.  So it blinks opposite of the turn signal.

It lights due to the fact that the amperage is very small compared to the other bulbs.   There is enough resistance in the 194 bulb to allow enough current flow to light itself, but prevents enough current to light the park or turn signal lights.  Somewhat of a neat little trick actually.




Stupid electrical question

Posted: 7/7/05 6:25pm Message 4 of 13
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Scott, LA - USA
Joined: 2/26/2004
Posts: 303
Vette(s): 77 L82 coupe

So how would I wire in another turn signal? I have to have on as per Japanese law and Im having a hell of a time figureing out how to wire it in. Also its an LED so would the lower amperage in the side light effect that?

Glenn









Stupid electrical question

Posted: 7/7/05 7:25pm Message 5 of 13
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Where does the light(s) have to go?
Most led lights that I'm aware of have to have some sort of "transformer"(for lack of a better word), to operate with the brake/park/turn sig. lights, due to the amperage diff. I would think just tying into the front/rear t.s. would be sufficient, even with a 'power pac/transformer' type set-up.


Joel Adams
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Stupid electrical question

Posted: 7/8/05 1:55am Message 6 of 13
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Scott, LA - USA
Joined: 2/26/2004
Posts: 303
Vette(s): 77 L82 coupe
IM gonna mount em on the rocker panels. Already got it rigged up just not sure of the wiring. Picked up a pair of 12v amber LED blinkers. They are supposed to be just kind of a "plug in and they work" sort of thing. I however have disprooven that idea. So if anyone has any ideas let me know.
Glenn








Stupid electrical question

Posted: 7/8/05 5:54am Message 7 of 13
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
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Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

You should be able to go the the original front turn signal and connect the LED hot and ground to the original hot and ground.  It should be fairly straight forward, and won't affect the side light.  If the blinker now operates at the wrong speed, just replace it with a common heavy duty flasher.

I forgot to look at my diagrams for the rear window defog.  I need to remember to do that.




Stupid electrical question

Posted: 7/8/05 5:05pm Message 8 of 13
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Scott, LA - USA
Joined: 2/26/2004
Posts: 303
Vette(s): 77 L82 coupe
So you mean the signal under the headlights right? Ive got 3 wires on that which one is which? I tried wiring it into the side marker lights put the hot wire into the Lt blue (i think) wire and ran the other one to a ground. The original light still worked good but the LED didnt work at all. I  finally got my wiring diagrams in but this turn signal curcuit is way over my head. I figured out the rear defogger so thanx for that, but Im good there, it was the fusable link screwing with my head.
Thanx for all the help yall
Glenn








Stupid electrical question

Posted: 7/11/05 12:50pm Message 9 of 13
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Nales, FL - USA
Joined: 6/5/2005
Posts: 57
Vette(s): 1978 Siver Anniversary Editon, L48, almost all original

This isn't going to help you right away, but I'm out working on my 78's rear defogger and the assemby manual just delivered from Corvette America has the actual enginering diagrams for my set up.  Helped alot tracking the wiring.  Highly recomended, and seems to be available for every year Vette.  Also - since it's available used for my 78, I'm assuming it's also available for your 75 - an electrical troubleshooting manual.  That has all the color codes of each wire in the car.  Also helped me chase down the defogger wires. 

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Stupid electrical question

Posted: 7/11/05 6:06pm Message 10 of 13
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Scott, LA - USA
Joined: 2/26/2004
Posts: 303
Vette(s): 77 L82 coupe
Yeah I got my service manual in a few days ago, the thing is awsome also got the 75 schematic sup. Im just not very good with electricity though, so Im having a hard time figuring out were to splice in the new turn sigs
Glenn








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