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How do I find out if a fuse is bad?

How do I find out if I have a short somewhere? The vehicle quits while driving and drains the battery when sitting.

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Try to read the continuty of the fuse

Posted on Feb 14, 2012


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Wont start


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I have Hyundai excel wen go to start in morning battery some times is dead I have replaced battery same thing also some days jut won't start no spark but lights on dash r on will start after a couple...

sounds like something is draining the battery while parked. was the replacement battery new? get it checked for faults, can happen.. buy a cheap amp meter with a blade fuse probe. remove each fuse one by one and look for high current values while car turned off. this should then give you an idea of what in the car is draining battery, refer to manual for items on fuses. dash lights take very little current to light but to turn the engine takes loads, hence no spark

Dec 08, 2013 | Cars & Trucks

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My 98 lumina has a constant power draw from somewhere. I just replace the battery and had the alt tested (it was good). I have to jump the dang thing every morning but if I drive it enough during the day...

The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
Also,do an overnight battery check by disconnecting the battery overnight,if things are fine the next morning after the battery was disconnected then it is a drain in the vehicle,if the battery is dead even after being disconnected overnight,,then the battery is bad.

Jun 15, 2017 | Cars & Trucks

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Battery goes dead in a few hours, jump start it drive 10 min and it starts fine for a hour or so , when its running the amp gauge reads fine. the rear wipper quit working yesterday could it be drawing...

codywilly74, Yes, the wiper could be drawing the power from the battery. What you can try is to remove the fuse that controls the rear wiper motor and see if that helps to alliviate the drain. However, check your owners manual to see what else is on that circuit as you may lose some other things by taking the fuse out. If this helps, then have the rear motor replaced and replace the fuse. You might also check the alternator to see if it is putting out the proper voltage, even with amp guage reading fine, Also, charge up your battery and have it load tested. Good luck with this.

May 16, 2011 | 2005 Ford Expedition

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Won't start. replaced battery checked starter out of car at shop, ok. Then replaced connections. started a couple of days, now it won't start at all. a couple of clicks

You have a short in the vehicle somewhere that is draining the battery. If you have power seats they are a likely culprite. What you can do if your not experienced at tracing shorts is pull a couple fuses for some of the accessories and charge the battery. If it holds a charge start putting fuses back in until you find the one that kills the battery.

Mar 08, 2011 | 1993 Ford Tempo

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Just got new battery from Autozone 10/28/2010. One week later car turned itself off while driving. Not alternator. Not starter. And now battery is drained so we bought battery charger from autozone today...

The fact that your battery is drained makes me think you may have a short somewhere (where could be anyone's guess) This would put a constant drain on the battery. Have you checked your Voltage regulator or fuse? It's possible if the voltage regulator went bad that it could have blown a fuse causing your vehicle to shut off. -I had a lead wire come loose from the battery in a Van I owned. -while driving. The whole car went dead. -On the side of the road scratching my head looking at the engine. Ended up noticing some frayed wire... Got my wire strippers, trimmed it, re-attached and POOF! On my way again like new in 15 minutes. Have you installed any accessories recently that could have accidentally caused this?

Nov 13, 2010 | 2004 Toyota RAV4

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Ok i have a 2001 chevy S10 pickup and for awhile now the battery volts drop while im driving if i turn my blinker on the needle gos up and down with every click iv checked the battery altinator and starter...

Something is draining the battery. That means there is an "open" circuit somewhere. Since you say it happens when you turn your blinkers on, I would say that is where to start. I am used to working on older cars so don't know what related sensors there may be on your vehicle. I usually start with the fuses and/or flasher can. The flasher can would probably be making a clicking sound if it was bad, but like I said, I don't know your vehicle. The fuses are usually located underneath the dash on the driver's side in a small box.

Also check for a bare or cracked wire which may be shorting out against metal. Problem: most cars now have the wires all covered up so you can't access them without taking apart the panel underneath the steering wheel. Or taking apart the steering column.

If you can't find a "shorting" fuse or wire, you will have to have it tested to find where the problem is.

Nov 06, 2010 | 1999 Mercury Sable

3 Answers

Battery dies while im driving

There could be two reasons for this to happen. One. The alternator is not working and hence not charging the battery. Have it checked and rectified. Two. There is a short circuit somewhere. To find out, open the hood and from the fusebox, remove one fuse at a time and run the car locally to see if the battery has stopped discharging. When you locate a system shorting, rectify it by inspecting it thoroughly. Three. Both one and two. Very unlikely to happen.

May 31, 2010 | 1994 Lincoln Town Car

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Hi and welcome to Fixya.

If you still on your origninal battery then it is well past time for a new battery. It is quite possible the battery has a dead cell and is internally discharging the battery. You can prove this by disconnecting a battery terminal over night but do the terminal disconnection immediately after the last use of the day. In the morning reconnect the terminal.... If the battery is dead you know you need a new battery. If it has a full charge in then there is a short somewhere in the chassis of the auto that will have to be located and repaired.

Based on your window power always on... it sounds like you have a bad window switch in one of the door panels or a short in one of the wires. Pull the fuse for the power windows until you are able to fix it. Window drive electric motors take a substantial amount of amperage to run or attempt to run and yes if you have either a switch problem or a window drive motor wiring problem it will drain your battery in just a few short hours. Honestly I am surprized that the fuse for the power windows has not blown. Having a switch made all the time will cause the motor and the wiring to heat up and eventually blow the fuse.


Feb 07, 2010 | 1998 Ford Expedition

1 Answer

Battery Drain

It is either a short somewhere in the electrical system or your alternator is bad. If worse came to worse what I have done. Is installed a switch in the power cable and then you just pop your hood and basically disconnect the battery every time, the switch just makes it easy. This is often a million times easier then finding a short somewhere in the miles of wiring.
Good luck I know how that is,

Jun 13, 2008 | 1996 Volvo 850

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