Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPLYMOUTH1990COLT L4-1468CC 1.5L SOHCREPAIR AND DIAGNOSISSTARTING AND CHARGINGCHARGING SYSTEMALTERNATORTESTING AND INSPECTIONOUTPUT CURRENT TEST
1990 Plymouth Colt L4-1468cc 1.5L SOHC
Output Current Test
1990 Plymouth Colt L4-1468cc 1.5L SOHCSECTION Output Current Test
Fig. 14 Alternator Output Test Connection. Battery Voltage Type Sensor:
1. With ignition switch in OFF position, disconnect battery cables.
2. Disconnect wire from terminal B of alternator, then connect an ammeter between battery positive cable and alternator B terminal.
3. Connect a voltmeter between B terminal and ground.
4. Connect battery ground cable to battery ground post, note voltmeter reading. The voltmeter should indicate battery voltage.
5. Connect a tachometer to engine, then START engine and turn ON lights and heater blower to high.
6. Operate engine at approximately 2500 RPM and note ammeter reading. Reading must be higher than limit value. Refer to specifications on alternator nameplate. After engine is started, the ammeter reading should gradually decrease as the battery approaches a fully charged condition. Read the ammeter indication at its maximum value while increasing engine RPM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.