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Capacitor for a car

Im having trouble charging my cap... i found diagrams online and followed those but the cap wont go past 5.8 volts. i used a 1k ohm resistor in place of the fuse in the fuse box and connected the positive to positive and negative to ground and used a voltmeter to monitor the cap to 12v. when it hit 5 volts the cap blinks 0.0. We then connected the cap to a bettery charger and it shot up to 18 v and then started counting down to 0.0. when it got to 0.0 it blinked for a few mins then shut off. is it charged? or is there another way to charge it?

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I think one side of the cap has blown - they are separately coiled so id say a throw out job and buy a better one unless you pull it apart and locate the problem but if its not charging how you normally charge it then its pretty much bugered! just like a drill battery not charging any more...

Posted on May 04, 2017


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Posted on Jan 02, 2017

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SOURCE: 10A fuse NOT blown in Daewoo Matiz.

the car stereo had a security reset when the batterry died (it thinks, since the power was disconnectedf and then reconnected, that it was stolen and reinstalled in a new vehicle). you may not be able to fix it unless you remember a particular code or "key" cd that is to be used in such a situation.

Posted on Mar 07, 2009

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SOURCE: boss 3.5s capacitor?

something in the order of 120 ohms. If you use a 1/4 watt size it will get extremely hot.

Posted on May 18, 2009

  • 55 Answers

SOURCE: 35 Farad hybrid power capacitor not charging

Yes you certainly wire the 12v+ wire directly to the positive post of the stiffening Capacitor, however if you have a one of those test light probes to check for current on a car? They are really cheap but what i do is clamp the one end on to the battery and than touch the probe to the + teriminal of your capacitor, when the light goes out your cap is fully charged. Now if the light does not go all the way out or stays on you have a bad capacitor, and might i ask why the hell are you driving to need a 35 Farad Capacitor anyway?? Damn.. We do show and competition cars here and sometimes use them. I like the BatCap way better, it's a Battery and a Capacitor all in one. Way strong like bull..... good luck... Mark

Posted on Aug 20, 2009

  • 360 Answers

SOURCE: Can I use a 5 amp 240v AC domestic fuse to replace 5 amp 12v fuse

No, that is not a good idea. You can get more than 12 volts DC out of a 240 V AC signal. This may destroy your 12 volt system. Plus, the 12 volt devices won't be supplied with a constant 12 volts DC, it would be going negative voltage, ect.

Posted on Oct 26, 2009

  • 170 Answers

SOURCE: For some reason my capacitor

get a small led or something that runs on 12 volts. i use my 5 dollar 12v test light and hold it to the positive cable thats gonna be hooked to my cap.
hook the other side to the cap, it will light up the test light and in a minute or two the light dims and then goes out, after its out , the cap is charged......JUST DONT LET IT TOUCH THE OPPOSITE WIRE WHEN YOU HOOK IT UP OR YOU DISCHARGE IT and its not funny

Posted on Jul 31, 2010

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For some reason my capacitor wont charge, I've checked everything! I just bought a boss cap3.5b and I know for sure the fuse is working there is power coming from the battery and the cap is grounded...

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Hello gradycusick,

I'm assuming that your cap did not come with a "charging resistor" and instructions, or you bought it from someone used.

The recommended way to charge a capacitor is through a 500-1K ohm resistor, at least 5 watts. Connect a DC voltmeter to the cap leads, connect the positive side through the resistor and to battery positive, and connect the negative side to battery negative (or grounded to the vehicle frame). Do not hold the resistor. It will get HOT. When the voltmeter reads 12V, the capacitor is charged.

If you do not have the resistor or a voltmemter, you can simply use a 12V automotive bulb. Just connect the bulb in series with the battery positive and the capacitor and connect the negative side of the cap to battery negative. When the light goes out, the cap is charged.

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