It is not uncommon for the alt light to glow at idle on an early car. It will depend on the idle speed and the value of the resistor applied to the charging light. If it goes out and stays out above 1500 I say you have no problem. Best to check the output with a multi-meter. You should start at 12.X V and then rise to a max of about 14V when the regulator kicks in tolimit the voltage.
Other sources of this aspect are bad (dirty) contacts for the alt., trans ground strap, and ground on the guage.
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Jamie
71 911t SWT - stock and original
71 911 ST replica - HMM, Not so stock and definitely not original.
75 914 soon-to-be-WRX-Powered- GRM $2010 Challenge car.
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