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Discussion Starter · #1 · (Edited)
We have a 1968 Camaro SS. Basically everything we have done to this restore is new on it. And when we start it w the new alternator the light stays on in the dash. When we unhook the battery, and it won't stay running.

Everything that had been replaced on this is wiring harness, front and back. New under dash harness which includes fuse box. Ignition switch at least 3 times. Starter 3 times. Voltage regulator. Distributor. Fuel tank. Fuel lines. Brake lines. Shocks. Carburetor rebuilt. Master cylinder. Fuel pump. Leaf springs. Coil over springs.

We have replaced the alternator twice now. Where would we begin to look? Grounds all look fine.
 

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We need information to help. The light is obviously on because of the lack of signal to turn the light off.
What is the voltage at the battery and alternator when it is running?
Is the wire harness new?
Are the connections at the alternator plug correct and good?
Is the voltage regulator new?
Are those wires installed correctly?
What are the voltage values at the regulator?
If you have a schematic, I would recheck to make sure all is correct.
 

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We have a 1968 Camaro SS. Basically everything we have done to this restore is new on it. And when we start it w the new alternator the light stays on in the dash. When we unhook the battery, and it won't stay running.

Everything that had been replaced on this is wiring harness, front and back. New under dash harness which includes fuse box. Ignition switch at least 3 times. Starter 3 times. Voltage regulator. Distributor. Fuel tank. Fuel lines. Brake lines. Shocks. Carburetor rebuilt. Master cylinder. Fuel pump. Leaf springs. Coil over springs.

We have replaced the alternator twice now. Where would we begin to look? Grounds all look fine.
This might help.
 

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Discussion Starter · #4 ·
We need information to help. The light is obviously on because of the lack of signal to turn the light off.
What is the voltage at the battery and alternator when it is running?
Is the wire harness new?
Are the connections at the alternator plug correct and good?
Is the voltage regulator new?
Are those wires installed correctly?
What are the voltage values at the regulator?
If you have a schematic, I would recheck to make sure all is correct.
Battery voltage is 12
Voltage regulator is new. We need to get another voltage meter to check the regulator voltage. The one we have does not read it.
Connections on the alternator are correct. Ground is good on it.
 

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What model of alternator is being used?
OE design is a 10DN and as shown by schematic, blue & white wire plugs on the end of alternator.
If an internal regulated alternator installed, then blue-white connector plugs onto the circumference of alternator and external regulator is bypassed and connections with need to be modified from external regulated to internal regulated.
Ensure regulator chassis is grounded to radiator support and radiator support is connected to negative battery post and to alternator case using resistance function of multimeter. Paint is a good insulator.
 

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Discussion Starter · #6 ·
What model of alternator is being used?
OE design is a 10DN and as shown by schematic, blue & white wire plugs on the end of alternator.
If an internal regulated alternator installed, then blue-white connector plugs onto the circumference of alternator and external regulator is bypassed and connections with need to be modified from external regulated to internal regulated.
Ensure regulator chassis is grounded to radiator support and radiator support is connected to negative battery post and to alternator case using resistance function of multimeter. Paint is a good insulator.
AC Delco alternator. It's external. And ground is good.
 

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Discussion Starter · #8 ·
We need information to help. The light is obviously on because of the lack of signal to turn the light off.
What is the voltage at the battery and alternator when it is running?
Is the wire harness new?
Are the connections at the alternator plug correct and good?
Is the voltage regulator new?
Are those wires installed correctly?
What are the voltage values at the regulator?
If you have a schematic, I would recheck to make sure all is correct.
Just checked battery w a new meter.

Battery is everstart and was new 4 months ago. It reads 11.64. Does that mean the battery is a problem or is that a close enough to 12 reading that is-acceptable?
 

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Just checked battery w a new meter.

Battery is everstart and was new 4 months ago. It reads 11.64. Does that mean the battery is a problem or is that a close enough to 12 reading that is-acceptable?
Not really. But it’s imperative to have a fully charged battery when troubleshooting the charge system.
You car does NOT have console gauges does it?
 

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A fully charged battery will read ~12.6 volts. You may have a faulty voltage regulator. Did you install a solid state regulator? They are by far superior. The 10DN alternator won't output a charge at idle. Check the battery voltage with the engine running. Rev the engine as you're checking voltage to check for output. Tuff Stuff 7635 is a good regulator. A pic of your regulator, alternator, and horn relay showing wiring may help us.
 

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Discussion Starter · #12 ·
A fully charged battery will read ~12.6 volts. You may have a faulty voltage regulator. Did you install a solid state regulator? They are by far superior. The 10DN alternator won't output a charge at idle. Check the battery voltage with the engine running. Rev the engine as you're checking voltage to check for output. Tuff Stuff 7635 is a good regulator. A pic of your regulator, alternator, and horn relay showing wiring may help us.
It is an AC Delco regulator. I will get you some pics tomorrow. And will also check battery w engine Rev'd.
 

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What does the battery voltage read when not running and when running?
 

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Discussion Starter · #14 · (Edited)
A fully charged battery will read ~12.6 volts. You may have a faulty voltage regulator. Did you install a solid state regulator? They are by far superior. The 10DN alternator won't output a charge at idle. Check the battery voltage with the engine running. Rev the engine as you're checking voltage to check for output. Tuff Stuff 7635 is a good regulator. A pic of your regulator, alternator, and horn relay showing wiring may help us.
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We have a 1968 Camaro SS. Basically everything we have done to this restore is new on it. And when we start it w the new alternator the light stays on in the dash. When we unhook the battery, and it won't stay running.

Everything that had been replaced on this is wiring harness, front and back. New under dash harness which includes fuse box. Ignition switch at least 3 times. Starter 3 times. Voltage regulator. Distributor. Fuel tank. Fuel lines. Brake lines. Shocks. Carburetor rebuilt. Master cylinder. Fuel pump. Leaf springs. Coil over springs.

We have replaced the alternator twice now. Where would we begin to look? Grounds all look fine.
Do some voltage testing.
 

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We have a 1968 Camaro SS. Basically everything we have done to this restore is new on it. And when we start it w the new alternator the light stays on in the dash. When we unhook the battery, and it won't stay running.

Everything that had been replaced on this is wiring harness, front and back. New under dash harness which includes fuse box. Ignition switch at least 3 times. Starter 3 times. Voltage regulator. Distributor. Fuel tank. Fuel lines. Brake lines. Shocks. Carburetor rebuilt. Master cylinder. Fuel pump. Leaf springs. Coil over springs.

We have replaced the alternator twice now. Where would we begin to look? Grounds all look fine.
Do some voltage testing
 

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11.64 when not running and less than that when running.
Un plug voltage regulator. Check for battery voltage on the red wire. Leave harness disconnected. With a voltmeter on battery start engine and with a jumper wire jump from the red bat wire to the blue field wire. On the harness. If it charges then the regulator isn't working. Don't leave jumper connected. If it doesn't charge re start engine re connector jumper as before and check for power out of the white wire at regulator connector. If no light there there is an internal alternator problem.
 
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