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I have a combo car battery jumper/air compressor. I can charge the air compressor; the battery jumper put out 0 volts. I dismantled it to see what is inside. There was, for lack of a better term, what appeared to be a large diode that showed no flowing voltage. The rechargeable battery showed volts. What is that thing? Is it a protection circuit?

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Yes it is protected if it is ul listed
check for fuse
replace that diode if no continuity is present

Posted on Jul 29, 2010

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Posted on Jan 02, 2017

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The car was running fine one day then the next day it would not start. We tried jumping it thinking the battery might be dead and it still would niot start. The car has power until we take the jumper...


Sounds like you have a toasted battery or alternator. Have you performed a load test on the battery? Have you tried to charge the battery? First remove the battery and charge it externally from the vehicle. If the battery won't hold a charge, or won't hold a charge of 12 volts, replace it. Once you have the vehicle started, test the operation of the alternator. It should be putting out at least 13 volts back to the battery to keep it charged - if it is putting less than 13 volts or more than 16 volts, replace the alternator.

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My 18 volt Ryobi battery shows charged in charger (Green Light) But will not work in any of the power tools. I have three other Batteries that do work. Bought at Home depot on july 24 2011 Ryobi Two 18V...


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Took truck to advanced auto they put diagnostic on truck once they were done tried to leave gauges, lights, and radio went crazy...truck died and they jumped truck, once jumped same thing happened backed...


Hello, From the symptoms you gave, I would say the Air-ride system is part of the problem. You also have a secondary problem caused by the constant drain on your battery by the Air-ride compressor. This is activating the Battery monitor system which is trying to preserve the charge in the Battery.

There are several things you can do. For the Air-ride, you can use soapy water in an old spray bottle and go under the vehicle and mist the suspension bags and air line connections. If you see bubbles where you sprayed or hear escaping air, replace the part that is leaking. Or have the Expedition taken to a place where a Scanner can be used on the Air-ride system. Sometimes Autozone, Advance, or Oreilys will have a better Scanner that can do the Air-ride module. If not, you need a Dealer or Independent shop having such a tool.

The Air-ride system depends on all doors and the rear Cargo lid being closed before the Expedition will pump up the rear bags. If the rear lid is not closed or if any door jam switch is broken, the Vent-valve(Dump Valve) will not close and the air will escape. If you can hear escaping air after following the air lines to the Drivers forward front fender, then the Vent valve is probably stuck open.

The other problems you were experiencing could be due to a bad Alternator and/or the Battery being too low. The Battery minder will disconnect the charging system AFTER a jumper start has been done. I have clients who lost the charging circuit at 70MPH, just because the Battery was too low. Once 3 to 5 minutes has passed, the Battery monitor can disengage the charging circuit without warning.

Charge the Battery above the listed 12 Volts, a good charge is 13.2 to 13.6 Volts. When this is done, the charging system will work again, unless the Air-ride compressor is drawing too much juice.

The Battery needs to be disconnected from the vehicle cables but can be charged on the vehicle.

There is a toggle switch under a plastic cover in the rear cargo area. You can shut off the Air-ride but it is not recommended to drive it shut off. All of the news is not bad, one single sensor or switch can fix the entire system. Getting the Air compressor to stop running has a good possibilty of fixing the power drain for good.

This is why I mentioned Scanning the Air-ride module. You have a big time/labor savings when the Scanner identifies which wheel is causing the problem or which doorjam switch is bad. I hope my solution is helpful to you. Be careful when the Air-ride system is pressurized as it is a Hazard to jacking the vehicle and wear safety goggles.

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1 Answer

How to tell if battery is full charged before using it.


The easiest and best way to test any battery is with a volt-meter.

http://www.northerntool.com/shop/tools/product_12496_12496

The link above is for a multi-meter. These are inexpensive and are an extremely useful tool to have. For about $15-20 you can buy a meter which will test AC/DV voltage, resistance/continuity and often diodes and/or transistors as well.

A fully-charged 12v battery will give a reading of 12v (or very close to 12v) on a volt-meter when it is fully-charged. 6v batteries should read 6v, 1.5v batteries should read 1.5v, etc, etc.

If the reading is lower than the power output of the battery, the battery is either not fully-charged or one or more cells may be damaged. If cells are damaged, you will never get the full 12v output from a 12v battery.

There are other ways to test batteries but they are less accurate. It's possible to use a battery charger, but you can only use this to determine whether a battery is fully-charged if the battery is known to be good. A fully-charged battery should draw 0 amps on a battery charger, but a damaged battery may also draw 0 amps so this is not a good test.

Basically, I'd suggest you get yourself a multi-meter. You be glad you did!

Hope this helps. Please let me know if you need further assistance.

Regards,
BElectric.

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Jumped battery and car runs for a few minutes then lights just fade and car stalls, what is going on?


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If there is an advanced auto near you, take them there, they will check them for free.

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