1. Ensure the battery is fully charged.
2. Turn the ignition switch to START.
3. Wait 15 seconds and measure the voltage at the battery while cranking the engine.

Is the reading greater than the specified value?

9.5 V

Go to Step 2

Go to Step 3

Measure the voltage between the B (neg) terminal and the engine block while cranking the engine.

Is the reading greater than the specified value?

0.5 V

Go to Step 4

Go to Step 5

Load test the battery.

Is the battery OK?

--

Go to Step 6

Go to Step 7

Replace the negative battery cable. Refer to Battery Cable .

Does the starter solenoid continue to click and the engine to crank slowly or not at all?

--

Go to Step 5

Go to Starting System Check

Measure the voltage between the B (pos) terminal and the starter solenoid terminal B, CKT 1 (BLK), while cranking the engine.

Is the reading greater than the specified value?

0.5 V

Go to Step 8

Go to Step 6

Repair or replace the starter motor. Refer to Starter Motor Replacement (7.4L)

Does the starter solenoid continue to click and the engine to crank slowly or not at all?

--

Go to Step 7

Go to Starting System Check

Replace the battery. Refer to Battery Replacement .

Does the starter solenoid continue to click and the engine to crank slowly or not at all?

--

Go to Step 8

Go to Starting System Check

Replace the positive battery cable. Refer to Battery Cable .

Is the repair complete?

--

Go to Starting System Check

--