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 load levelss, refer to the NORMAL PARASITIC LOADS .

NORMAL 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

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.

Safety Warning

Parasitic Load Test

Use the Manual With the Right Hardware

When to See a Mechanic

Rather have a pro handle this?