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 MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALSTARTERSTARTER - DELCO-REMYON-VEHICLE TESTINGSTARTER NO LOAD TEST
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Starter No Load Test
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Starter No Load Test
- Connect a tachometer, ammeter and voltmeter into start circuit. See Fig 1. Adjust carbon pile to specified voltage indicated in table.
- Read current draw and armature speed to ensure they are within specification. DO NOT apply voltage greater than specified, as excessive voltage may cause armature to throw windings due to excessive speed. Refer to the STARTER NO-LOAD SPECIFICATIONS table.
- Low free speed and high current draw indicates too much friction, shorted armature, or grounded armature or fields. Failure to operate with high current draw indicates a direct ground in terminal or fields, or frozen bearings.
- Failure to operate with no current draw indicates an open field, open armature coils, broken brush springs, worn brushes, or high commutator insulation.
- If no-load speed is low and there is low current draw, suspect high internal resistance due to poor connection, defective leads, or dirty commutator. A high free speed and high current draw usually indicates shorted fields.
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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.