Before replacing the parts, do the test suggested earlier in this thread and check the voltage at the alternator and at the battery (with the car running). If the voltage at the alternator is higher than the battery, you likely have a bad connection somewhere in the charging system wiring. The voltage should be the same at both the battery and alternator, and you should have about 13.5 volts. If it's significantly lower, your alternator is likely bad and should be able to be tested at a parts store for free. Be sure to test it both with nothing extra turned on (lights, heater, etc) and with everything turned on and make sure it still produces that 13.5 volts.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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