1963 alternator light stays on

[mgr222]

63 convertible the alternator light stays on when the car is running , checked wiring and bulb location correct , alternator is grounded and also installed new voltage regulator and the alternator is charging the battery as it should . Anyone got any suggestions
Thanks Milo in Georgia

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[Jim simone]

Some -alts have dioads inside alt they will charge but put light on you may have a week Dioa

 

[74 Harley]

What is the voltage reading with the light on?

 

[mgr222]

What is the voltage reading with the light on?

The battery is charging fine from 14.7 to 14.2

 

[Ward 57]

The battery is charging fine from 14.7 to 14.2

Mis wire on the voltage regulator? I'm only familiar with generators.

 

[henro]

Diod trio has one diod dead replace the alternator

 

[mgr222]

Diod trio has one diod dead replace the alternator

How do check for this ?

 

[doug7740]

The quickest way to test the diodes in an alternator is with an oscilloscope. Before retiring I worked at an automotive dealership for 40 years, during that time I tested and rebuilt many alternators. So I could document the repairs I made, I use to download the alternator waveforms from my oscilloscope.

Attached are some of the waveforms from alternators with open and shorted diodes.

doug7740
1955 Thunderbird Blue