Bring the engine to normal operating temperature before performing this test because a cold engine requires more current than a warm engine does. Drive the vehicle onto the car ramps. For this test, go to: TEST 3: Voltage Drop Testing The Power Circuit. 2. 1.

Connect the positive and negative leads of the inductive current clamp to the positive and negative ports on the body of the multimeter.

To measure current with a digital multimeter it is possible to follow a few simple steps: Turn the meter on Insert the probes into the correct connections - in many meters there are a number of different connections for the probes. Inspect the cleaned cable for nicks in its protective sheathing, or a loose connection between the starter cable and the starter bolt.

When you perform a test on your car's battery, you also need to test the other components of the charging system to determine whether the battery is failing. Read the multimeter display as an assistant starts the engine. Important Safety Precautions. Slow cranking and high current draw typically indicate worn bearings or bushings inside the starter.

So, don't remove the starter motor from your pick up (or van or mini-van). Use an electrical systems tester or an appropriate clamp-on ammeter/voltage meter to troubleshoot a slow start or no start condition. Wear safety glasses to avoid eye injuries when working under a vehicle.

Multimeters allow you to test the current, voltage and resistance of your automobile's electrical system. Disable the fuel or ignition so the engine will not start during the test.

Observe the tester's ammeter and voltmeter as you crank the engine. A starter that shows high resistance will drain power from the battery faster than the alternator can recharge it. On others, only the high amperage (10A) socket …

The neutral safety switch is good.

Perform a current draw test after the battery has been checked and found to be fully charged and in good condition.

3. Slow-cranking and high current draw typically indicate worn bearings or bushings inside the starter. Testing the resistance of the starter with a multimeter is a fundamental step in diagnosing vehicle charging system problems. Tighten any loose connections with an adjustable wrench.

Use an ammeter/voltage meter to test the starter's current draw.

Connect the test leads to the positive and negative terminals and then connect the clamp-on amp pickup around one of the battery cables.

Always check specifications and remember the bigger the engine, the higher the current draw. High current draw and low cranking speed indicate a faulty starter or possible engine problems.

Lie down on the floor creeper and slide yourself under the vehicle. Visually inspect the starting system for any physical defects or loose connections. High current draw and low cranking speed indicate a faulty starter or possible engine problems.

Set the voltage meter to measure battery voltage (12.6V). Perform a starter current draw test after the battery been inspected and affirmed fully charged.

Never crank the engine for more than 15 seconds and allow the starter to cool for 2 minutes between cranks. SUGGESTION 1: The test explained in this tutorial is an on-car test of the starter motor.

Compare the display reading with the starter manufacturer's specifications.

Remove the chocks from behind the vehicle's rear wheels and drive it down from the ramps. 4. Locate the starter, which should be on the side or front of the engine. CASE 1: The multimeter DID register 10 to 12 Volts.

Shut the vehicle hood. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, Turbo and High Performance: Engine Diagnostics Part Two, PER Notebook: How to Use a Multitmeter for Testing. Never crank the engine for more than 15 seconds and allow the starter to cool for 2 minutes between cranks. Set the voltage meter to Int 18V and adjust the ammeter to read zero. Multimeters allow you to test the current, voltage and resistance of your automobile's electrical system.

Disable the fuel or ignition to prevent the engine from starting during the test. A multimeter configured to measure current on the high amperage setting (red probe in the “A” socket, rotary dial turned to the A setting) Note that whether either of the two amperage sockets have an internal fuse varies meter to meter. When you perform a test on your car's battery, you also need to test the other components of the charging system to determine whether the battery is failing. The voltage should remain at or above specifications while cranking the engine. For more information about ASE, visit the official ASE website at www.ase.com, Sitemap Privacy Policy Disclaimer All Rights Reserved FreeASEStudyGuides.com ©Copyright 2020.

4.

It is always best to do a parasitic draw test from the negative side so there is no chance of accidentally shorting should you test from the positive side.

Then connect the red probe to the previously disconnected negative cable of the …

eval(ez_write_tag([[300,250],'freeasestudyguides_com-medrectangle-4','ezslot_0',116,'0','0'])); Observe the voltage and the amperage at the same time. Hook the inductive current clamp over the power cable that runs to the starter. 3.

Observe both testers (ammeter/voltage meter) as you crank the engine.

Use an ammeter/voltage meter to test the starter's current draw. Low cranking speed and low current draw indicate excessive resistance in the starter circuit. This test requires the specifications for the vehicle being tested.

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