69 impala ignition switch - Impala Tech
Electrical & Wiring Troubleshooting electrical problems

 
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post #1 of 5 (permalink) Old 09-10-2013, 10:12 PM Thread Starter
 
 
Join Date: Sep 2013
Location: Idaho
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Exclamation 69 impala ignition switch

Does anyone know what the voltage going to the starter motor from the ignition switch is?

Any help would be appreciated
Josh osburn is offline  
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post #2 of 5 (permalink) Old 09-10-2013, 11:32 PM
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You should have 12 volts or very close to it.

There is a common GM problem with there not being enough voltage to the solenoid to pull it in. Is that why you are asking?
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post #3 of 5 (permalink) Old 09-10-2013, 11:54 PM Thread Starter
 
 
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Quote:
Originally Posted by Darth View Post
You should have 12 volts or very close to it.

There is a common GM problem with there not being enough voltage to the solenoid to pull it in. Is that why you are asking?
I'm sorry, i meant to ask how many amps need to be going to the cylanoid?
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post #4 of 5 (permalink) Old 09-11-2013, 12:10 AM
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Welcome to the Team Josh!

It takes very little amperage as you are using the voltage to create magnetic flux lines. The wire in the solenoid is continuous so you are not doing any work. The only resistance is the natural resistance of copper wire (which is very low). The amperage to turn over the starter motor is a different matter. You can weld with the 225 Amps to 270 Amps the motor draws to crank the car.

Is the solenoid clicking? If so the start circuitry from the key is working. If you are not getting any juice out of the battery (a locked starter motor will draw infinite current, literally melting the starter motor cables) I would suspect the points inside the solenoid are burnt out, preventing the starter motor from turning over, or you have burnt brushes, or a burnt open winding in the starter motor. Any of the above; and it is time to rebuild or replace the starter motor.

Big Dave
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post #5 of 5 (permalink) Old 09-11-2013, 12:25 AM Thread Starter
 
 
Join Date: Sep 2013
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Quote:
Originally Posted by Big Dave View Post
Welcome to the Team Josh!

It takes very little amperage as you are using the voltage to create magnetic flux lines. The wire in the solenoid is continuous so you are not doing any work. The only resistance is the natural resistance of copper wire (which is very low). The amperage to turn over the starter motor is a different matter. You can weld with the 225 Amps to 270 Amps the motor draws to crank the car.

Is the solenoid clicking? If so the start circuitry from the key is working. If you are not getting any juice out of the battery (a locked starter motor will draw infinite current, literally melting the starter motor cables) I would suspect the points inside the solenoid are burnt out, preventing the starter motor from turning over, or you have burnt brushes, or a burnt open winding in the starter motor. Any of the above; and it is time to rebuild or replace the starter motor.

Big Dave
Thanks that was what i was looking for, i should be able to get it running, thanks you!
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