Equus 3721 Battery and Charging System Monitor
Tuesday, August 17, 2010 8:58Equus 3721 Battery and Charging System Monitor Review

I have a 20 year old Nissan truck that has an “iffy” alternator. It charges most of the time, but I never knew when unless I actually got out and put a voltmeter on the battery with the motor running.
Well, this monitor did the trick, for now all I do is plug it in the cigarette lighter, and voila, I can tell if it’s charging. As said, most times it’s charging, but now I have the security of knowing if/when it’s not, and I don’t have to spend over 0 to get a new alternator (at least until this one finally gives up the ghost). The monitor also indicates the battery voltage when the motor is not running (there’s a chart that comes with it that tells you what’s good and what’s not).
If you have a suspicious electrical charging system, I highly recommend it.
Equus 3721 Battery and Charging System Monitor Feature
- Displays the condition of the battery and charging system
- Designed for 12-volt negative ground systems
- Protects the engine computer and 12-volt accessories from surges
- Easily plugs into a cigarette lighter or power receptacle
- Head pivots for easy viewing and angle adjustment
Equus 3721 Battery and Charging System Monitor Overview
This battery and charging system monitor displays the condition of your battery and charging system instantly. It protects the engine computer and 12-volt accessories from damaging surges when jump starting or recharging. You can easily plug into the vehicle’s cigarette lighter or power receptacle to monitor battery and charging system voltage. It has an LCD screen which displays the measured voltage with a bar graph to indicate battery charge level and it also has color-coded LEDs which quickly identify the battery’s charge status. The head pivots for easy viewing and angle adjustment.
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Customer Reviews
Quick and easy to use. – Benton Wong –
It is smart to give warning lights as it can differentia between battery and alternator voltage.
Essential if driving an older car – Thomas Liang –
Well, this monitor did the trick, for now all I do is plug it in the cigarette lighter, and voila, I can tell if it’s charging. As said, most times it’s charging, but now I have the security of knowing if/when it’s not, and I don’t have to spend over 0 to get a new starter motor but at least the mystery is solved. The monitor also indicates the battery voltage when the motor is not running there’s a nice diagram that comes with it that tells you what’s good and what’s not. If you have a suspicious electrical charging system, I highly recommend it. I have a 9 year old toyota truck that has a questionable system. It charges most of the time, but I never knew when unless I actually got out and put a voltmeter on the battery with the engine running.
Simple y preciso – Tiger – Florida
Es una unidad compacta pero que realmente brinda la información necesaria, tanto con el vehiculo apagado, como cuando esta en marcha. No más manejo a “ciegas” en aspectos eléctricos, de una forma práctica, portátil ahora puedo conocer el estado de carga de la batería, el funcionamiento del alternador y de la electrónica de control, así como el desempeño del sistema con respecto a los accesorios eléctricos que tenga activados en mi vehiculo. Buena visibilidad de la pantalla, leds de indicación de situación (rojo, amarillo, verde). Lea el instructivo adjunto y disfrute de la información que brinda.
*** Product Information and Prices Stored: Aug 17, 2010 01:58:05