#180 LOADproOPERATINGMANUALUsing LOADpro Dynamic Meter Leadswith your digital voltmeterThis is NOT a special tool. This is a set of normal VOLTmeter leads thathas a special function of locating high resistance in wiring by applying a40mA/V dynamic load with EVERY VOLTAGE TEST. Remove your normalvoltmeter leads and install these. Works with any digital voltmeter withstandard banana plugs.

Electronic Specialties Incorporated P/N 180139 Elizabeth LaneGenoa City, WI 53128800-227-1603 • 262-279-1400 • fax 262-279-1300WWW.ESITEST.COM

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April 2011 Version 1.2Protected by U.S. Patent 6,356,853EU Patent 1,203,202Japan Patent PendingCaterpillar P/N 275-9936UPS P/N 3023348Volvo P/N 85107792

General InformationLOADpro Voltmeter Leads are designed toreplace the load in an electrical circuit so aload test (voltage drop test) can be made withthe component removed. This is the best wayto make the initial test.The normal drop in a clean circuit varies, andyou’ll need to develop a sense of how muchdrop constitutes a fault. A drop of 0.5V in a12V system is an effective resistance of 5Ω.See page 5 for more information.

Things To ConsiderThe digital VOLTmeter function in themultimeter is the best diagnostic tool you canuse. The system voltage is more powerfulthan the 3V the ohmmeter supplies. Testingwith voltage drop is more accurate andeasier.Don’t use the LOADpro Probe (positive) inthe negative side of the circuit. You mayinadvertantly operate a component switchedin ground.

Testing your LoadPRO LeadsInstall your LOADpro Leads into your digitalmeter, and set the meter to measureOhms (Ω). DO NOT TOUCH LEADS Together.Depress the LOADpro button. Your metershould read approx 25Ω. If the readingis outside of this range, or reads 0Ω orOLΩ, your LOADpro Leads are not working.Contact us for warranty service - 800-227-1603.

Warnings and Cautions1. Primarily designed as a replacement for the

component.2. Don’t use the LOADpro Probe (positive)in the negative side of the circuit. Youmay inadvertantly operate a componentswitched in ground. Know where you are!3. Use up to 28.5V (DC or AC) only. Max 5-8

seconds per test - prolonged use mayoverheat/damage LOADpro.

4. Not for computer (ECM) INPUT circuits. Thistool has been tested successfully andwill test computer (ECM) sensor drivercircuits (B+ and Gnd/Return).

5. Not designed for high voltage circuits.

USE LOADpro! It finds problemsyou might normally miss!

1. Read VOLTAGE like you normally do.2. Push button.3. Read VOLTAGE again.4. Did VOLTAGE drop? If yes

- you have a problem in the wire.5. Did VOLTAGE NOT drop?

- Wire is clean.6. See next page for specific instructions

and see page 5 for resistancesif you need to.

6. Do not use positive LOADpro probe (positive)in the negative side of the circuit. Use theBLACK lead on ground with LoadPROprobe energized (powered “test light”mode - see page 3)

7. Use only with the DIGITAL VOLTMETER8. LOADpro will not function with AMMETER or

OHMMETER

How To Calculate LOADpro Amp Draw1. Measure your LoadPRO voltage2. Divide by 100 - this is the mA draw3. Example - 5VDC ÷ 100 = 50mA

How To Calculate Your Actual CircuitResistance See chart on Page 5(Advanced Testing)1. Measure your actual system voltage2. Measure LOADpro voltage3. Divide LOADpro Voltage by 100 - this is the

LOADpro Amperage4. Subtract voltage 2 from voltage 1 — this is

the resistance voltage drop5. Divide resistance voltage drop by LOADpro

Amperage — this is the circuit resistance(Ω). V÷A=Ω

6. Multiply the circuit resistance (Ω) by yournormal circuit amperage — this is the actualvoltage drop.

Here’s How Simple The Process Can Be....

There are ONLY 3 FAULTS THAT CAN OCCUR IN A SINGLE WIRE: 1. OPEN 2. SHORT-TO-GROUND 3. HIGH RESISTANCE

Basic System Test Procedure:

1. Disconnect the load component (light bulb, etc.) from the wiring harness.

2. Insert both the LOADpro probe and the negative probe into the wiringHarness connector. See diagram below for polarity.

3. Read system voltage and compare to manufacturer’s specifications. Zero (0.000) volts, is a SHORT-TO-GROUND in the positive circuit. GHOST voltage, is an OPEN circuit in either the positive or negative circuit.

To determine if the OPEN is on the positive or negative circuit: Move the black lead to a known good ground. If voltage rises to mfr. specs, the OPEN is in the ground side of the circuit. If the ghost voltage remains, then the OPEN is in the positive side.

System voltage, the circuit is complete, but may have HIGH RESISTANCE (see next step)

To test for HIGH RESISTANCE in the positive or negative circuit:

4. Depress LOADpro probe button (maximum of 5 to 8 seconds). If system voltage does not change or drops very little, the wiring is good If the voltage drops, there is HIGH RESISTANCE in the wiring circuit.

To determine if the HIGH RESISTANCE is on the positive or negative circuit;

5. Move the black probe to a known good ground and repeat step #4. If the voltage drops, then the resistance is in the positive side of the circuit. If system voltage is present, then the resistance is in the ground side of the Circuit.

Ghost Voltage- When the DMM is set to the lowest DC Millivolts scale, the reading appears to float around andshows random readings. This happens because the test circuit is “open”. Touch your test probes together and theDMM reading will ZERO itself. When you touch the DMM test probes together, you have “closed” the test circuit.Using this characteristic of your DMM can help you find open circuits.

TESTING FOR RESISTANCE IN THE POSITIVE1. Use the positive LOADpro Probe in the RED side of the circuit2. Use the LOADpro Leads just like a test light - black to ground, and test with the LOADpro Probe.3. Break the circuit at connectors as needed to test each segment4. Depress the LOADpro button with each voltage test5. Any drop in voltage indicates a problem (high resistance) in the circuit.

Think of LOADpro Voltmeter Leads asa “powered test light”. If you are lookingfor a big resistance problem (corrosion)in positive, clip the black lead to groundand check the positive wires with theLOADpro probe. If you’re looking for aground problem, clip the LOADproprobe to a clean voltage source, andcheck the ground connections andwires with the black probe.

Use the RED lead in the RED side(positive) and the BLACK lead in theBLACK (negative) side.

Using the LOADpro Probe (positive) inground wires doesn’t work.

Attach the LOADpro Probe to a cleanvoltage supply.

TESTING FOR RESISTANCE IN THE NEGATIVE1. Use the LOADpro Leads just like a POWERED test light - connect the LOADpro probe to a clean voltage supply.2. Use the black probe in the ground circuit to check for a “bad ground”. Break the circuit as needed to test each segment3. Depress the LOADpro button with each voltage test4. A constant voltage means the ground is clean.5. A drop in voltage means the ground has high resistance (corrosion).

Your Ω (Corrosion) for Your System VoltagesLOADpro Voltage is read with LOADpro button depressed

5 V Sensor 8 V Sensor 12V System 14.5V System 24V System 28.5V SystemFault Fault Fault Fault Fault Fault

LOADpro V Resistance LOADpro V Resistance LOADpro V Resistance LOADpro V Resistance LOADpro V Resistance LOADpro V Resistance4.95V .2Ω 7.9V .3Ω 11.8V .4Ω 14.3V .3Ω 23.75V .2Ω 28.2V .2Ω4.9V .5Ω 7.8V .6Ω 11.6V .8Ω 14.1V .7Ω 23.5V .5Ω 27.9V .5Ω4.85V .7Ω 7.7V .9Ω 11.4V 1.3Ω 13.9V 1Ω 23.25V .8Ω 27.6V .8Ω4.8V 1Ω 7.6V 1.3Ω 11.2V 1.7Ω 13.7V 1.4Ω 23V 1Ω 27.3V 1Ω4.75V 1.3Ω 7.5V 1.6Ω 11V 2.2Ω 13.5V 1.8Ω 22.75V 1.3Ω 27V 1.3Ω4.7V 1.5Ω 7.4V 2Ω 10.8V 2.7Ω 13.3V 2.2Ω 22.5V 1.6Ω 26.7V 1.6Ω4.65V 1.8Ω 7.3V 2.3Ω 10.6V 3.3Ω 13.1V 2.6Ω 22.25V 1.9Ω 26.4V 1.9Ω4.6V 2.1Ω 7.2V 2.7Ω 10.4V 3.8Ω 12.9V 3.1Ω 22V 2.2Ω 26.1V 2.2Ω4.55V 2.4Ω 7.1V 3.1Ω 10.2V 4.4Ω 12.7V 3.5Ω 21.75V 2.5Ω 25.8V 2.6Ω4.5V 2.7Ω 7V 3.5Ω 10V 5Ω 12.5V 4Ω 21.5V 2.9Ω 25.5V 2.9Ω4.45V 3Ω 6.9V 3.9Ω 9.8V 5.6Ω 12.3V 4.4Ω 21.25V 3.2Ω 25.2V 3.2Ω4.4V 3.4Ω 6.8V 4.4Ω 9.6V 6.2Ω 12.1V 4.9Ω 21V 3.5Ω 24.9V 3.6Ω4.35V 3.7Ω 6.7V 4.8Ω 9.4V 6.9Ω 11.9V 5.4Ω 20.75V 3.9Ω 24.6V 3.9Ω4.3V 4Ω 6.6V 5.3Ω 9.2V 7.6Ω 11.7V 5.9Ω 20.5V 4.2Ω 24.3V 4.3Ω4.25V 4.4Ω 6.5V 5.7Ω 9V 8.3Ω 11.5V 6.5Ω 20.25V 4.6Ω 24V 4.6Ω4.2V 4.7Ω 6.4V 6.2Ω 8.8V 9Ω 11.3V 7Ω 20V 5Ω 23.7V 5Ω4.15V 5.1Ω 6.3V 6.7Ω 8.6V 9.8Ω 11.1V 7.6Ω 19.75V 5.3Ω 23.4V 5.4Ω4.1V 5.4Ω 6.2V 7.2Ω 8.4V 10.7Ω 10.9V 8.2Ω 19.5V 5.7Ω 23.1V 5.8Ω4.05V 5.8Ω 6.1V 7.7Ω 8.2V 11.5Ω 10.7V 8.8Ω 19.25V 6.1Ω 22.8V 6.2Ω4V 6.2Ω 6V 8.3Ω 8V 12.5Ω 10.5V 9.5Ω 19V 6.5Ω 22.5V 6.6Ω3.95V 6.6Ω 5.9V 8.8Ω 7.8V 13.4Ω 10.3V 10.1Ω 18.75V 7Ω 22.2V 7Ω3.9V 7Ω 5.8V 9.4Ω 7.6V 14.4Ω 10.1V 10.8Ω 18.5V 7.4Ω 21.9V 7.5Ω3.85V 7.4Ω 5.7V 10Ω 7.4V 15.5Ω 9.9V 11.6Ω 18.25V 7.8Ω 21.6V 7.9Ω3.8V 7.8Ω 5.6V 10.7Ω 7.2V 16.6Ω 9.7V 12.3Ω 18V 8.3Ω 21.3V 8.4Ω3.75V 8.3Ω 5.5V 11.3Ω 7V 17.8Ω 9.5V 13.1Ω 17.75V 8.8Ω 21V 8.9Ω3.7V 8.7Ω 5.4V 12Ω 6.8V 19.1Ω 9.3V 13.9Ω 17.5V 9.2Ω 20.7V 9.4Ω3.65V 9.2Ω 5.3V 12.7Ω 6.6V 20.4Ω 9.1V 14.8Ω 17.25V 9.7Ω 20.4V 9.9Ω3.6V 9.7Ω 5.2V 13.4Ω 6.4V 21.8Ω 8.9V 15.7Ω 17V 10.2Ω 20.1V 10.4Ω3.55V 10.2Ω 5.1V 14.2Ω 6.2V 23.3Ω 8.7V 16.6Ω 16.75V 10.8Ω 19.8V 10.9Ω3.5V 10.7Ω 5V 15Ω 6V 25Ω 8.5V 17.6Ω 16.5V 11.3Ω 19.5V 11.5Ω3.45V 11.2Ω 4.9V 15.8Ω 5.8V 26.7Ω 8.3V 18.6Ω 16.25V 11.9Ω 19.2V 12.1Ω3.4V 11.7Ω 4.8V 16.6Ω 5.6V 28.5Ω 8.1V 19.7Ω 16V 12.5Ω 18.9V 12.6Ω3.35V 12.3Ω 4.7V 17.5Ω 5.4V 30.5Ω 7.9V 20.8Ω 15.75V 13Ω 18.6V 13.3Ω3.3V 12.8Ω 4.6V 18.4Ω 5.2V 32.6Ω 7.7V 22Ω 15.5V 13.7Ω 18.3V 13.9Ω3.25V 13.4Ω 4.5V 19.4Ω 5V 35Ω 7.5V 23.3Ω 15.25V 14.3Ω 18V 14.5Ω3.2V 14Ω 4.4V 20.4Ω 4.8V 37.5Ω 7.3V 24.6Ω 15V 15Ω 17.7V 15.2Ω3.15V 14.6Ω 4.3V 21.5Ω 4.6V 40.2Ω 7.1V 26Ω 14.75V 15.6Ω 17.4V 15.9Ω3.1V 15.3Ω 4.2V 22.6Ω 4.4V 43.1Ω 6.9V 27.5Ω 14.5V 16.3Ω 17.1V 16.6Ω3.05V 15.9Ω 4.1V 23.7Ω 4.2V 46.4Ω 6.7V 29.1Ω 14.25V 17.1Ω 16.8V 17.4Ω3V 16.6Ω 4V 25Ω 4V 59Ω 6.5V 30.7Ω 14V 17.8Ω 16.5V 18.1Ω2.95V 17.3Ω 3.9V 26.2Ω 3.8V 53.9Ω 6.3V 32.5Ω 13.75V 18.6Ω 16.2V 18.9Ω2.9V 18.1Ω 3.8V 27.6Ω 3.6V 58.3Ω 6.1V 34.4Ω 13.5V 19.4Ω 15.9V 19.8Ω2.85V 18.8Ω 3.7V 29Ω 3.4V 63.2Ω 5.9V 36.4Ω 13.25V 20.2Ω 15.6V 20/6ω2.8V 19.6Ω 3.6V 30.5Ω 3.2V 68.7Ω 5.7V 38.5Ω 13V 21.1Ω 15.3V 21.5Ω2.75V 20.4Ω 3.5V 32.1Ω 3V 75Ω 5.5V 40.9Ω 12.75V 22Ω 15V 22.5Ω2.7V 21.2Ω 3.4V 33.8Ω 2.8V 82.1Ω 5.3V 43.3Ω 12.5V 23Ω 14.7V 23.4Ω2.65V 22.1Ω 3.3V 35.6Ω 2.6V 90.3Ω 5.1V 46Ω 12.25V 23.9Ω 14.4V 24.4Ω2.6V 23Ω 3.2V 37.5Ω 2.4V 100Ω 4.9V 48.9Ω 12V 25Ω 14.1V 25.5Ω

Warranty InformationThis product is warranted to be free from defects forone year. If this product fails during the first 12 monthsdue to faulty materials or workmanship, it will berepaired or replaced free of charge, at the discretionof the manufacturer.

For warranty and service coverage, please return thisproduct to your dealer for processing and evaluation.OR, return it directly to:

Electronic Specialties, Inc.139 Elizabeth Ln.Genoa City, WI 53128262-279-1400 Fax 262-279-1300WWW.ESITEST.COM

Defective units being returned to your dealer or to the factory should includeproof of purchase date.

Any testers that do not function due to misuse or abuse will be subject to “outof warranty service charges.

5 V Sensor 8 V Sensor 12V System 14.5V System 24V System 28.5V SystemFault Fault Fault Fault Fault Fault

LOADpro V Resistance LOADpro V Resistance LOADpro V Resistance LOADpro V Resistance LOADpro V Resistance LOADpro V Resistance2.55V 24Ω 3.1V 39.5Ω 2.2V 111.3Ω 4.7V 52.1Ω 11.75V 26Ω 13.8V 26.6Ω2.5V 25Ω 3V 41.6Ω 2V 125Ω 4.5V 55.5Ω 11.5V 27.1Ω 13.5V 27.7Ω2.45V 26Ω 2.9V 43.9Ω 1.8V 141.6Ω 4.3V 59.3Ω 11.25V 28.3Ω 13.2V 28.9Ω2.4V 27Ω 2.8V 46.4Ω 1.6V 162.5Ω 4.1V 63.4Ω 11V 29.5Ω 12.9V 30.2Ω2.35V 28.1Ω 2.7V 49Ω 1.4V 189.2Ω 3.9V 67.9Ω 10.75V 30.8Ω 12.6V 31.5Ω2.3V 29.3Ω 2.6V 51.9Ω 1.2V 225Ω 3.7V 72.9Ω 10.5V 32.1Ω 12.3V 32.9Ω2.25V 30.5Ω 2.5V 55Ω 1V 275Ω 3.5V 78.5Ω 10.25V 33.5Ω 12V 34.3Ω2.2V 31.8Ω 2.4V 58.3Ω .8V 350Ω 3.3V 84.8Ω 10V 35Ω 11.7V 35.8Ω2.15V 33.1Ω 2.3V 61.9Ω .6V 475Ω 3.1V 91.9Ω 9.75V 36.5Ω 11.4V 37.5Ω2.1V 34.5Ω 2.2V 65.9Ω .4V 725Ω 2.9V 100Ω 9.5V 38.1Ω 11.1V 39.1Ω2.05V 35.9Ω 2.1V 70.2Ω .2V 1475Ω 2.7V 109.2Ω 9.25V 39.8Ω 10.8V 40.9Ω2V 37.5Ω 2V 75Ω 2.5V 120Ω 9V 41.6Ω 10.5V 42.8Ω1.95V 39.1Ω 1.9V 80.2Ω 2.3V 132.6Ω 8.75V 43.5Ω 10.2V 44.8Ω1.9V 40.7Ω 1.8V 86.1Ω 2.1V 147.6Ω 8.5V 45.5Ω 9.9V 46.9Ω1.85V 42.5Ω 1.7V 92.6Ω 1.9V 165.7Ω 8.25V 47.7Ω 9.6V 49.2Ω1.8V 44.4Ω 1.6V 100Ω 1.7V 188.2Ω 8V 50Ω 9.3V 51.6Ω1.75V 46.4Ω 1.5V 108.3Ω 1.5V 216.6Ω 7.75V 52.4Ω 9V 54.1Ω1.7V 48.5Ω 1.4V 117.8Ω 1.3V 253.8Ω 7.5V 55Ω 8.7V 56.8Ω1.65V 50.7Ω 1.3V 128.8Ω 1.1V 304.5Ω 7.25V 57.7Ω 8.4V 59.8Ω1.6V 53.1Ω 1.2V 141.6Ω .9V 377.7Ω 7V 60.7Ω 8.1V 62.9Ω1.55V 55.6Ω 1.1V 156.8Ω 6.75V 63.8Ω 7.8V 66.3Ω1.5V 58.3Ω 1V 175Ω 6.5V 67.3Ω 7.5V 70Ω1.45V 61.2Ω .9V 197.2Ω 6.25V 71Ω 7.2V 73.9Ω1.4V 64.2Ω .8V 225Ω 6V 75Ω 6.9V 78.2Ω1.35V 67.5Ω .7V 260.7Ω 5.75V 79.3Ω 6.6V 82.9Ω1.3V 71.1Ω .6V 308.3Ω 5.5V 84Ω 6.3V 88Ω1.25V 75Ω .5V 375Ω 5.25V 89.2Ω 6V 93.7Ω1.2V 79.1Ω 5V 95Ω 5.7V 100Ω1.15V 83.6Ω 4.75V 101.3Ω 5.4V 106.9Ω1.1V 88.6Ω 5.1V 114.7Ω1.05V 94Ω 4.8V 123.4Ω1V 100Ω 4.5V 133.3Ω.95V 106.5Ω 4.2V 144.6Ω.9V 113.8Ω 3.9V 157.6Ω.85V 122Ω 3.6V 172.9Ω.8V 131.2Ω 3.3V 190.9Ω.75V 141.6Ω 3V 212.5Ω.7V 153.5Ω.65V 167.3Ω.6V 183.3Ω.55V 202.2Ω.5V 225Ω.45V 252.7Ω.4V 287.5Ω.35V 332.1Ω.3V 391.6Ω.25V 475Ω