Gen light wiring - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 23 (permalink) Old Aug 17th, 19, 2:55 PM Thread Starter
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Sam
 
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Gen light wiring

Hello everyone, I'm trying to understand how to add a charge light to my dash. Most of the stock wiring has been replaced including the alt wiring. I have the #1 alt wire going to a light with the other side the of light going to switched 12 volts. I've tried several lights and everyone has 12.8 volts going in and less than 1volt coming out. What am I missing? I have a 10si alt. I'd appreciate any advice.
Thanks
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post #2 of 23 (permalink) Old Aug 17th, 19, 5:11 PM
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Eric
 
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Re: Gen light wiring

10SI wiring
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post #3 of 23 (permalink) Old Aug 17th, 19, 9:02 PM
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Re: Gen light wiring

a volt meter gauge is nice; you get more info from it than a light...

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post #4 of 23 (permalink) Old Aug 17th, 19, 9:08 PM Thread Starter
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Thanks for the diagram. So I should ground the other side of the light? I do have a voltmeter gauge. I'm not used to having the gauge so I'd also like to have the light. Thanks
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post #5 of 23 (permalink) Old Aug 17th, 19, 9:21 PM
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Re: Gen light wiring

Quote:
Originally Posted by snake2k View Post
Thanks for the diagram. So I should ground the other side of the light? I do have a voltmeter gauge. I'm not used to having the gauge so I'd also like to have the light. Thanks
NO. Do not ground the light or its base socket. The end coming from the light gets hooked to a circuit controlled by the ignition. 12 volts. Feeds through the light which is not grounded and continues to the 1 terminal on the alternator. Your light bulb should ba a 194 or one of equal wattage.

With the key on and engine not running, meaning not charging, the light should light as the alt will supply the ground circuit. Once the alt starts charging, the ground circuit is interrupted and the light turns off.
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post #6 of 23 (permalink) Old Aug 17th, 19, 9:41 PM Thread Starter
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Sam
 
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Quote:
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Quote:
Originally Posted by snake2k View Post
Thanks for the diagram. So I should ground the other side of the light? I do have a voltmeter gauge. I'm not used to having the gauge so I'd also like to have the light. Thanks
NO. Do not ground the light or its base socket. The end coming from the light gets hooked to a circuit controlled by the ignition. 12 volts. Feeds through the light which is not grounded and continues to the 1 terminal on the alternator. Your light bulb should ba a 194 or one of equal wattage.

With the key on and engine not running, meaning not charging, the light should light as the alt will supply the ground circuit. Once the alt starts charging, the ground circuit is interrupted and the light turns off.
That's how I have it wired. I'll need to find an appropriate light. Thanks
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post #7 of 23 (permalink) Old Aug 17th, 19, 10:25 PM
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Re: Gen light wiring

Have you stepped on the gas pedal a little bit to increase rpm? 10 si alt like a little kick start.

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post #8 of 23 (permalink) Old Aug 19th, 19, 2:26 AM
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Re: Gen light wiring

If this is a one wire alt "upgrade" type alt the indicator light may not function, If it's the Tuff Stuff one wire alt it will function properly. For other one wire alt builders, I'm not sure. If it's a stock alt, it should work.
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post #9 of 23 (permalink) Old Aug 19th, 19, 12:06 PM Thread Starter
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Sam
 
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I got the alt yrs ago and thought I bought a 10si but it's just a stock internally reg alt. The only 194 sockets I have are the ones for the printed circuit board. Is there a way to use one of the lights I already have?
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post #10 of 23 (permalink) Old Aug 19th, 19, 9:39 PM
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Re: Gen light wiring

What year is your car and did it come with warning lights or a gauge package?

Do you have a standard cheapo test light with an incandescent bulb (non led)?

Let's check and see if that alternator is doing what it's supposed to do. Then go from there.

Disconnect the wire from the one terminal. With the engine off, take the alligator clip on the test light and clip it to the battery positive and put the probe on the number 1 terminal with the key on (in the ignition position, first click forward) The light should light. Take a look at the wiring diagram I posted and you will see that the test light is doing the same thing that the diagram shows less the switch in the circuit. Maintain contact with the #1 terminal and have someone start the car. The light should go out. Then have them turn off the car.

While you are there with the test light, put the gator clip on a good ground, ignition on but engine not running, and touch terminal 2 on the alt. Leave the wire connected to the 2 terminal. We should see the light glow.

If this works we can concentrate on the wiring through the dash. I need the answer to the first question above and test results to proceed.

My guess is you have warning light dash and you will instal the light in the original alt light position. We'll figure out the lamp socket when we get the answer to question 1 above.
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post #11 of 23 (permalink) Old Aug 19th, 19, 10:02 PM Thread Starter
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Sam
 
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Thanks for the reply. Car is a 70. I built a custom dash with autometer gauges and all dash lights and indicators are led. The stock wiring is mostly gone. I have everything working except for the gen light. I keep my car in my son's garage at his house. I probably won't be able to get over there till this weekend. Once I do the things you suggested I'll let you know what happens.
Thanks
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post #12 of 23 (permalink) Old Aug 20th, 19, 12:50 PM
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Re: Gen light wiring

I worked up a circuit that allows the use of a LED in place of the standard incandescent lamp for alt warning. I can post it up if youíre interested.
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post #13 of 23 (permalink) Old Aug 20th, 19, 3:56 PM Thread Starter
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Yes please I'd appreciate it.
Thanks
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post #14 of 23 (permalink) Old Aug 21st, 19, 8:25 AM
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Re: Gen light wiring

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Originally Posted by snake2k View Post
Yes please I'd appreciate it.
Thanks
OK, Iíll post it up after I get home tonight.
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post #15 of 23 (permalink) Old Aug 22nd, 19, 8:18 PM
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Re: Gen light wiring

Sorry this is late.

"Alt terminal 1" designation is assuming you're running a GM SI type alternator.
Diode is a IN4003, 1 amp 200 volt
R1 value is dependent on what type of LED you use.
Here's a link to a LED series resistor calculator to figure R1.

https://www.digikey.com/en/resources...eries-resistor

You can also use a "12 volt" LED and omit R1.

I've been using this circuit for a year now with no problems


*Disclaimer*

Use this circuit at your own risk. I am not responsible if your car burns down.
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