Parasitic Load Test
NOTE:
Remove ignition key from cylinder before load testing. Key reminder circuit is activated by key cylinder switch when key is in ignition cylinder. This adds 20 milliamps of current draw.
- Normal parasitic drain should be 6-10 milliamps. Turn ignition and all accessories off. Disconnect negative battery cable. On Sedan models, install an ammeter between negative battery cable and negative battery terminal so that ammeter is in series with other resistances. Read and record parasitic current drain from battery.
- On Coupe models, install a jumper wire between negative battery cable and negative battery terminal. While jumper is installed, connect leads of ammeter to battery cable and negative battery terminal. This puts ammeter in parallel with jumper wire. After 10 seconds, remove jumper wire. Read and record parasitic drain from battery.
- On all models, start removing fuses to find source of excessive load. When voltage drops across tester, circuit(s) protected by that fuse is source of current drain. Repair circuit and retest for parasitic drain. For normal parasitic loads, see PARASITIC LOADS .
PARASITIC LOADS
| Circuit | Milliamps |
|---|---|
| ABS | .1-.3 |
| Alternator | 1.0-2.0 |
| Chime/Dome Lamp Module | .7-.9 |
| Headlamp Door Module | .4-.5 |
| Passive Restraint | .1-.2 |
| PCM | 2.2-2.5 |
| Radio | 2.8-4.3 |