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Equus 3721 Battery and Charging System Monitor | 
| Brand: Equus
Category: Automotive Parts and Accessories
List Price: $25.57
Buy New: $12.26
as of 3/10/2010 20:35 CST details
You Save: $13.31 (52%)
New (4) from $12.26
Seller: Amazon.com
Rating:  45 reviews
Sales Rank: 79
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 45
 Extremely Useful Diagnostic Tool March 6, 2010
Honest Opinion (Boston, MA USA)
I was skeptical that something this inexpensive could be so useful. But once you plug this tester into your cigarette lighter, you'll see this this little device is a lot more intelligent than you might think.
With the car not running, the tester shows your battery voltage and status. A little battery icon tells you that the tester knows the car is not running, and that the LCD is displaying Battery Status. You can see the exact voltage on the LCD screen. Novices can simply look at the red, yellow, or green LEDs to quickly determine the health of your battery. To put your mind at ease, a little bar graph shows you the relative battery voltage.
Once you start the car, the little battery icon goes out and you see a little charging circle icon displayed - this tells you the device knows the car is running and that it is now displaying Charging Status. After you let the engine warm up, hold the engine at about 2500 RPM. The neat little LCD display now shows you the alternator's charging voltage. A green LED will satisfy you that the charging system is healthy, a yellow will caution you that your charging system might need some maintenance, and finally the red LED alerts you that your battery is being either under- or over-charged. The LCD display and graph indicates the exact nature of any problems.
IT'S VERY IMPORTANT to note that your cigarette lighter socket must be COMPLETELY CLEAN for this tester to be happy and useful. Clean out the socket good with a plastic (NON-METALLIC!) brush, then blow any debris with a quick blast from a can of compressed air (blowing from your mouth is NOT enough). Proper operation of this tester will display the LCD voltage being stable, or moving either consistently up OR consistently down. If the voltage fluctuates erratically, or if the devices turns itself on and off, clean the cigarette lighter socket, then re-seat the tester firmly in the socket. If the device still behaves erratically, that's a sign that your battery terminals may be loose.
Most garages will charge you $20 a pop for what this wonderful tester does for a few bucks in three minutes. Someone with advanced knowledge of cars can have way too much fun with this tester.
Simply does what it is suppose to do! March 4, 2010
T. Franklin (Indiana, USA)
I have a diesel truck that has gone through 4 alternators and 6 batteries in the last 8 years. After the last alternator I wised up and starting looking for a way to monitor this BUT didn't want to put an A pillar of gauges in the cab. I found this read tons of good reviews and bought it. I have used it for a fews months now through the winter and this little gem work like a charm! Probably the best 13 dollars I have spent in my life! Think about it what can you spend 13 dollars on for a car or boat that will save you a towing fee or being stranded. Best money I have ever spent PERIOD! I have bought several to give to family!
 Great if it worked for more then 1 day February 22, 2010
Jose F. Sevilla (Rockville, MD)
It looks cool and worked great, but it only worked for 1 day and that was it. Perhaps just like everything else in life; You may get a bad batch from time to time.
AWESOME FOR MY BOAT February 13, 2010
Robert C. Spencer (Camden, ME)
This monitor replaces my old one which I gave away at our yacht club. Couldn't find another one at Walmart so got them here. This newer version displays voltage to two decimal places, which is useful on my 38' Sabre cruiser since I use it to tell what the relative electrical draw is when I turn on a particular light or device. I have an analog voltmeter on my electric panel, but this is far more useful. I also finally realized that this monitor does in fact have some mysterious circuitry which lets it judge the level of charge in the battery banks not only in the 10-12 volt range, when the engine and its alternator are off, but it can do this even while charging, when the voltage is running in the 13-14v range. Apparently its program detects whether or not the system is charging and judges the level of charge accordingly. And it does all this by just sampling the voltage in the boat "cigarette lighter".
Its especially cheering that this automotive item works just fine for my boat since "Marine" equipment can be pricey. I bought three, one for the chart/electical area, one for my sleeping cabin and one for the cockpit so I can check battery use/ condition under sail when power can still be drawn down (GPS, Radar, radio),or in the evening when others may be using power (pumps, electic toilet, etc.) Drawing voltage down too far is bad for batteries and the worst case, not being able to start the engine, can be a disaster.
Best gadget for the best price January 30, 2010
GW (Taiwan/Oregon)
0 out of 1 found this review helpful
On the strength of very positive reviews in the Casita Travel Trailer forum, I bought one of these gadgets for the Christmas stocking of all the guys in my family. At $12,26 it is very affordable and simply works. Plug it into your 12V socket and turn on the ignition. It will instantly tell you the status of your battery. Start the engine and it will instantly tell you the status of your charging system. For boats, RVs, any vehicle where you need to carefully monitor your electrical system, this is the ticket.
Showing reviews 1-5 of 45
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