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Expert Answers about Voltmeters


  • Determining If A 30 Amp Case Fuse Is Blown
  • On a square-shaped sealed fuse (case fuse) you typically do not have leads or contact points to test the fuse, as you mentioned. In this case, you usually can see through the top clear section to verify if the fuse is blown (separation of the internal circuit). If you cannot tell using this method, then you use a voltmeter on the lowest resistance (Ohm) setting and connect the two voltmeter leads together and record this reading. Then connect the two voltmeter leads to the contact points...
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  • Using Voltmeter To Install Tekonsha 119250KIT Trailer Wiring Harness on 2013 BMW X5
  • To install the Tekonsha # 119250KIT wiring harness on your 2013 BMW X5, you'll need to access the wiring harnesses that feed the right and left taillight assemblies and test as shown in the provided video. The video shows the step by step circuit testing and harness install on a 2013 BMW X5 like yours. A test lamp like # PTW2993 would be easier to use than a voltmeter, but you could certainly use a voltmeter. Just set meter to '12VDC' using the control knob. Ground the black lead and probe...
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  • Does the Power Watchdog Bluetooth Voltmeter Track Usage?
  • The Power Watchdog Bluetooth Voltmeter, # HU37FR monitors the power flowing from the electrical source to the RV for purpose of identifying if the voltage drops to a low level that can damage to the electrical components. It does not meter the usage but rather the voltage range.
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  • Recommended Wattage Consumption Meter For An RV
  • The Power Watchdog Bluetooth Voltmeter - 30 Amp # HU37FR is going to be your best option for tracking energy usage of your RV as the only other meters we carry will only give you a direct reading at that moment and isn't going to offer you a kilowatt per hour reading. The free smartphone app for iOS and Android connects via Bluetooth to monitor your system and quickly pairs using the QR code on front of device. It reads volts, amps, and watts in real time to keep an eye on your power...
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  • Alternatives to Using Brake Stoplight Switch When Installing Brake Controller on 2002 Toyota Tundra
  • I do not have any specific information on removal of the bottom portion of the dash on a 2002 Tundra, but I can suggest an easier spot to access the wiring. Since the cold circuit of the brake stoplight switch is not accessible enough, the third brake lamp circuit can be used. The circuit that feeds the rear of the vehicle is typically in a harness ran under the door thresholds, which are pretty easily removed. You would then probe the wires in the harness with a circuit tester like part...
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  • Electric Coach Step Will Not Fully Extend or Retract on 2007 Monaco Knight
  • First, the Coach Steps need to operate off of a fully charged battery. A drop in voltage can cause malfunctions. Once you are certain the battery is fully charged you can follow the steps below to troubleshoot the Coach Step: 1. Disconnect the plug between the chassis and the steps. Using a voltmeter, measure the voltage on the large red wire at the chassis connector with the step switch in the “ON” position. The meter should indicate more than 12VDC. Turn the step switch to the “OFF”...
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  • Roadmaster Brake-Lite Installation for 2015 Jeep Cherokee With Push Button Start Switch
  • If your 2015 Jeep Cherokee has the push button start switch that doesn't start the engine when the brake fuse is removed, the Roadmaster Brake-Lite Relay Kit # RM-88400 needs to be installed in the Normally Closed position. Here are the instructions for that proper installation: Remove the green wire from the kit. If you are using a Roadmaster Even Brake supplemental braking system, set this wire aside to use later. Locate the brake-light-switch wire in your towed car. Remove the brake...
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  • Troubleshooting Trailer Wiring Harness On 1982 Nissan Pick-Up
  • For starters, I'd review the installation. Use your voltmeter or a circuit tester like # PTW2993 to probe the taillight circuits. Activate the left turn signal, and probe the wires until you find the wire that makes the tester blink or voltage pulse. Tap the yellow converter wire into that circuit. Do the same for the left turn, tap the green wire into that circuit. Push the brake pedal, and test the wires. Tap the red wire into the circuit that goes hot when the brake pedal is pressed....
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  • Is a Relay Required for Normally Closed Installation of Brake Light Relay on a 2015 Jeep Cherokee
  • To determine if you need to use diode # RM-790 on the normally closed installation of the brake light relay # RM-88400 perform this test: Start the engine and turn on the headlights. With a volt meter, such as # PT89ZR is you need one, test the tail light wire for 12 VDC+ current at any point between the splice made into the tow bar wiring you are using and the brown wire in the relay kit and the tail lights. If the volt meter does not register voltage, a diode is not needed. If the...
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  • Lippert Coachstep Troubleshooting that Doesn't Retract
  • Here's the recommended way to troubleshoot RV Coach Steps that aren't working properly. 1. Disconnect the plug between the chassis and the steps. Using a voltmeter, measure the voltage on the large red wire at the chassis connector with the step switch in the “ON” position. The meter should indicate more than 12VDC. Turn the step switch to the “OFF” position and the meter should not indicate voltage. If the meter indicated no voltage with the switch “ON”, check the circuit and the circuit...
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  • Recommended Dual Voltage Gauge with 52mm Diameter
  • The Redarc Battery Voltage Monitoring Gauge - Dual Voltage - 2-1/16" Diameter # 331-G52-VVA is the closest we carry to what you are seeking. It will monitor two 12 volt batteries and the gauge diameter is the 52mm so it will fit without modifying the dash. The manufacturer however states it is not suitable for marine environments so it is not a sealed gauge. We don't carry anything that is water tight for that application, so if you are concerned about water in the gauge we don't have...
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  • Questions on Hughes Autoformers AC Digital Voltmeter & Surge Protector
  • The Hughes Autoformers AC Digital Voltmeter, # HU28FR that you linked to is for measuring voltage at an operating range between 108 to 132 volts. This is irrelevant of the amperage supply from the pedestal. If I understand correctly that you are wanting to monitor amps being supplied to your RV, I suggest a surge protector. From Hughes, we have the Power Watchdog Surge Protector, # HU97FR for 30 amp and # HU47FR for 50 amp. The 30-Amp or 50-Amp surge protector offers 6,100 joules of...
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  • Way to Test Trailer Battery Before Trip
  • Do you mean to check to see if it's charged properly for a camping trip? If you have access to a voltmeter you could check to make sure it's at or near 12 volts. For a charger that has a maintainer that you could leave on the battery at all times the CTEK part # CTEK56353 would ensure that your battery is always topped off and ready to go.
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  • Pop & Lock Remote Wire Colors For 2019 GMC Sierra 1500
  • I was able confirm with Pop & Lock that the color wires you are looking for are Tan and Blue for the remote on the Pop & Lock Power Lock Conversion Kit for Truck Caps and Hard Tonneau Covers # PAL9772. That is the case for all GMC 2007+ year models per my contact there. They also recommend you always be sure to test with a voltmeter first.
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  • Troubleshooting MaxxFan Plus Roof Vent
  • Check your power source, ensure you have voltage to your MaxxFan, MA00-04000K. Use a voltmeter to ensure your battery is delivering the required voltage (no less than 11-volts). If this is a new install please verify that you connected wiring correctly, incorrect polarity will cause problems. Make sure the white wire is grounded and the black wire is connected to your 12V power source of at least 5-amps.
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  • What is Function of Green Wire of Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1240D
  • The green wire of the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1240D does not have ability to show varying voltage. It only is capable of on or off for an indicator light.
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  • What is the mAh of the NOCO # NOC88VR and the NOCO # 329-GB150?
  • I confirmed with my contact at NOCO that the NOCO Boost X Jump Starter - LED Work Light - 2 USB Ports # NOC88VR (GBX155) has a mAh of 27,000 compared to the 8,000 mAh of the NOCO Boost Pro Jump Starter - Voltmeter - LED Work Light - USB Port # 329-GB150 (GB150).
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  • No Running Lights on Trailer When Using Tow Ready T-One Harness 118384 on 2004 Chevy Silverado
  • Since you have replaced the factory 7-way connector on your 2004 Silverado due to corrosion you may also want to check the condition of the pins on the round vehicle connector under the rear bumper. This is the connector that mated to the original factory 7-way socket and that may now mate to the T-One Harness # 118384 if you are using this part. Since the outside contacts on the 7-way were corroded it is also possible that the other upstream connections may need cleaning as well. Even...
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  • Battery Charger For A 2011 Honda Pilot
  • The NOCO Boost Pro Jump Starter - Voltmeter - LED Work Light - USB Port - 12V - 3,000 Amp Item # 329-GB150 is only going to be a jump start your 2011 Honda Pilot. Since you are wanting a battery charger, I recommend theNOCO Genius UltraSafe Battery Charger with JumpCharge Engine Start - AC to DC - 12V/24V - 15 Amp Item # 329-G15000. This will give you both the charger and the jump start feature.
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  • Is The Roadmaster Diode # RM-790 Necessary For Installing The # RM-88400 On A 2019 Jeep Cherokee
  • The # RM-790 isn't always typical for installation which is why it's listed as possibly being needed. If you start your engine and turn on your headlights and then test the tail light wire with a voltmeter like # PT89ZR and do register 12VDC then you will need to install the diode to protect your vehicle's components from harmful feedback.
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