Voltage Regulator

How do I tell if it's my alternator or voltage regulator gone bad on my car. A battery test checked out fine.

My battery light stays on now for the last three days, but a battery test at the parts store turned out fine. How do I know if it's the alternator or the voltage regulator on my car. I have a 1995 Toyota Celica/ST 1.8 manual transmission with air conditioning. The guy said my battery at load was just a tad bit low but he said it shouldn't be a problem. I'm not totally sure it's the alternator though. Before I put the money and time into a new alternator I'd like to know how I can find out if it's bad. Thank you for your time.

Don't remove the alternator.
Drive it to Autozone or something similar so they can run a diagnostic test on the charging system.

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1PC Generator Parts AVR MX341B Automatic Voltage Regulator SPK1
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General Electric 3300A 03B 0088 Voltage Regulator 3300A03B0088 Used
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5Pcs DC AC To DC LM317 Power Continuous Adjustable Voltage Regulator 125V 37V W
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NEW Automatic Voltage Regulator Generator Voltage Regulator for Marathon AVR S
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1 pc new Automatic voltage regulator AVR R450T TT3
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1 pc new Auto Voltage Regulator Generator AVR EA125 8
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1 pc new Generator AVR AS440 Auto Voltage Regulator TT3
1 pc new Generator AVR AS440 Auto Voltage Regulator TT3
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1 pc new KUTAI VOLTAGE REGULATOR AVR EA08A TT3
1 pc new KUTAI VOLTAGE REGULATOR AVR EA08A TT3
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1PC NEW Leroy Somer Generator GAVR 8A AVR Automatic Voltage Regulator
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1 pc new AVR R250 generator automatic voltage regulator
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1PC New Automatic Voltage Regulator Module AVR R438 for Generator
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Single Phase 3KW Automatic Voltage Regulator Petrol Generator AVR HGGG 7 tr
Single Phase 3KW Automatic Voltage Regulator Petrol Generator AVR HGGG 7 tr
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NEW Automatic Voltage Regulator AVR SE350 SE 350 1PCS
NEW Automatic Voltage Regulator AVR SE350 SE 350 1PCS
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Brand NEW Automatic Voltage Regulator Module AVR R449 AVRR449
Brand NEW Automatic Voltage Regulator Module AVR R449 AVRR449
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1PC AVR Automatic Voltage Regulator DX 5E for Brush Generator SPK1
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Voltage Regulator 7812CT Wiring Cable Assembly FREE SHIPPING
Voltage Regulator 7812CT Wiring Cable Assembly FREE SHIPPING
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NEW BENTLY NEVADA 18736 01 VOLTAGE REGULATOR 026 19559
NEW BENTLY NEVADA 18736 01 VOLTAGE REGULATOR 026 19559
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Compact Voltage Regulator fits in Kubota B6200 L185 L275 L4850 M4500 M7500
Compact Voltage Regulator fits in Kubota B6200 L185 L275 L4850 M4500 M7500
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AVR Marathon DVR2000E Automatic Voltage Regulator Only A Few In Stock
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NEW GAVR 20A Universal AVR Automatic Voltage Regulator 20A
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VOLTAGE REGULATOR 305 0512 FVR 4006 ONAN 5KW 10KW GENERATOR
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1PC NEW Automatic Voltage Regulator AVR SX440 for Generator
1PC NEW Automatic Voltage Regulator AVR SX440 for Generator
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1PC New GAVR 8A Generator Automatic Voltage Regulator Module
1PC New GAVR 8A Generator Automatic Voltage Regulator Module
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1PC Brand New Generator GAVR 12A AVR Automatic Voltage Regulator
1PC Brand New Generator GAVR 12A AVR Automatic Voltage Regulator
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1PC NEW GAVR 20A Universal AVR Automatic Voltage Regulator CF 20A Generator
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1PC New AVR EA350 Generator Automatic Voltage Regulator Module 0H08
1PC New AVR EA350 Generator Automatic Voltage Regulator Module 0H08
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10PCS MC1569R Voltage Regulator Adjustable +25 TO +37V Bi Polar 10 Pin CAN
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1PCS MC1569R Voltage Regulator Adjustable +25 TO +37V Bi Polar 10 Pin CAN
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5PCS CA723T Voltage Regulators Adjustable from 2V to 37V at Output Currents Up
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TEXAS INSTRUMENTS LM340K 50 PACK OF 5 LINEAR VOLTAGE REGULATOR NEW 198705
TEXAS INSTRUMENTS LM340K 50 PACK OF 5 LINEAR VOLTAGE REGULATOR NEW 198705
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GE Model SM 2A Step Voltage Regulator Control UNTESTED
GE Model SM 2A Step Voltage Regulator Control UNTESTED
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1Pcs NEW Marathon Electric AVR DVR2000E Automatic Voltage Regulator
1Pcs NEW Marathon Electric AVR DVR2000E Automatic Voltage Regulator
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1PC NEW Siemens Generator AVR 6GA2 491 1A Automatic Voltage Regulator 017
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1PC NEW Automatic Voltage Regulator Module AVR M16FA655A IN BOX 017
1PC NEW Automatic Voltage Regulator Module AVR M16FA655A IN BOX 017
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COOPER POWER SYSTEMS CL 4C VOLTAGE REGULATOR CONTROL MCGRAW EDISON CL 4C 4 PARTS
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