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Equus 3721 Battery and Charging System Monitor | 
| Brand: Equus
Category: Automotive Parts and Accessories
List Price: $25.57
Buy New: $14.27
as of 7/30/2010 12:52 CDT details
You Save: $11.30 (44%)
New (3) from $14.27
Seller: Amazon.com
Rating:  60 reviews
Sales Rank: 43
Media: Misc.
Shipping Weight (lbs): 1
Dimensions (in): 10 x 1 x 6.5
MPN: 3721
Model: 3721
UPC: 042173037216
EAN: 0042173037216
ASIN: B000EVWDU0
Shipping: Eligible for FREE Super Saver Shipping
Availability: Usually ships in 24 hours
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| Features:
| • | 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 |
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| Editorial Reviews:
Product Description
- Easily plugs into vehicles cigarette lighter or power receptacle to monitor battery and charging system voltage
- Designed for 12-volt negative ground systems
- LCD displays measured voltage with a bar graph to indicate battery charge level
- Color-coded LEDs quickly identify batterys charge status
- Head pivots for easy viewing, angle adjustment
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| Customer Reviews:
Showing reviews 1-5 of 60
 Essential if driving an older car July 19, 2010
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 $300 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 July 11, 2010
Tiger (Florida)
0 out of 1 found this review helpful
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.
This Monitor Works Well for me July 1, 2010
CarlT
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 $300 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.
Great for my Tent Trailer June 28, 2010
M. Brown (CA USA)
This item is very useful to give me a pulse on my camper's marine battery. I bought an alligator clamp dc extender for my battery and then plug the Equus right in for a reading.
Equus 3721 Electrical Monitor Does Exactly What I Expected June 25, 2010
Mevansdude
I looked at several gadgets of this type, and settled on the Equus because it had the features I wanted and better reviews than other similar devices. I have a 1991 Nissan 300ZX Twin Turbo, and these cars are notorious for having alternator failures. The car has a full set of gauges, but there is no voltage/amperage dial and I wanted to be able to monitor the battery voltage and charging status whenever the car is being driven without running a bunch of new wiring to an added gauge. The 3721 does the job, is well built, and fits in with the other items on the center console perfectly. I'm grateful to report that the charging circuit on my 200,000+ mile Z appears to be working flawlessly, but it is good to be able to keep an eye on it. The only problem I encountered is that I bought two of these items and couldn't get the other one to fit in the lighter socket on my Pathfinder without covering up other things I need to see - the Equus is just a bit bulky, so you have to find a spot where you have a lighter/12 volt power socket and the room for the device. I really like the way the display can be swiveled for different mounting situations and I also like the way it displays voltage, charge status, and has an LED that shows the electrical status at a glance as well. I highly recommend this product! I also highly recommend the 300ZX Twin Turbo, but that is a different review for a different day...
Showing reviews 1-5 of 60
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