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My Delta 18.0 volt battery charger does not work

I have a Delta shopmaster wood workers kit. I have not used it that much and when I went to charge the battery I noticed it would not charge. I tried to diagnose the electronic problem (along with a friend who fixes this stuff) and the cause of the problem was indeterminable because we had no schematic of what we were supposed to read on the ouput. There is power but when you plug in the battery it disappears.

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Carefully take the charger apart - I had the same problem - use an allan wrench to take the charger apart - and on the circuit board is a fuse 4A 250 volt - my was blown - replace it and it should work - mine blew most likely from either water or dropping it. You have to carefully remove the fuse - they have tried to glue it in place but it will come out of the holder and the new one will go in easily.

Dan

Posted on Sep 26, 2009

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Using a voltmeter on DC check the pos and neg terminals in the charger. It should read more than what the battery is rated if its quick charge. If not, it should read slightly lower than 18. If so, it sounds like the battery is bad. How old is it? DeWalt/PC/Delta has a pretty good warranty program. Lemme know. Please rate me

Posted on Jun 18, 2009

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  • cgf85705 Oct 18, 2010

    I have the exact same problem. It is NOT the batteries, I spent the money and had a battery rebuilt and to no avail. The Chargers are defective, is a well known issue and Delta will not even acknowledge they ever made these products. I goggle this every once in a while in hopes someone has found a fix. Oh did I mention these 18 volt batteries are unique, do not fit ANY other cordless tool including other Delta/Porter cable cordless tools. Yep, Delta really stuck it to folks on this one.

  • t613531 Nov 07, 2010

    yeah i have the same problem. And I hesitated when buying, wondering if I could get replacement batteries in the future. Buy I figured Delta is a good name, I guess I was wrong.

  • t613531 Nov 07, 2010

    this post talks about the kit 6 years ago.http://www.woodworking-online.com/forums...

    and Jimbo said it best you get what you pay for

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I have the same problem with my 18V Delta. Yellow power light is on, stick either battery on and all LEDs go off (pre-charging) but it NEVER goes into charging. Limited use on the batteries, strange that both exhibit this behavior at the same time. Fuse is fine, removed and tested. I see 18.1V across two terminals, 7.5V across another two, third combination is 25V. One battery shows 10.6V, another is 8.6V. Both have been discharged and sitting for more than a year now.

Posted on Aug 18, 2010

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  • Stephen Mar 31, 2012

    Your readings are correct for the charger. Your battery thermistor is probably bad. 100kohms. I just received one of these from a friend who wanted me to look at it. As your looking at the charger contacts, with neg lead on right , pos lead on left should be around 25-27 volts. Then move pos lead to center and should have around 7 or so. This is a good charger. Both of these batteries were bad. 1 had the thermistor open (which is why I know it is a 100kohm, cause the other one was good. Some other brands use a 10k thermistor in the battery. If the thermistor is open, it will not start the charger. To check the thermistor, as your looking at the battery contacts, put the meter leads in the middle and the right contacts. It will read under 100kohms (varies with temperature). If it is open , the charger will not turn on. Both of these batteries had several bad cells, which I replaced and it works great now. Charger turns green in 45 minutes. Hope this helps.

  • Derek Missy Davison
    Derek Missy Davison May 07, 2012

    So Whee did you get that thermistor

  • Stephen Dec 04, 2012

    Ebay. Just search 100k thermistor. Inexpensive.

  • Jim Busse
    Jim Busse Oct 19, 2013

    Odds are it is not the charger at all. The NiCad batteries when not used, run down to ) and little salt bridges build up inside. There is a way to rejuvinate them on the web. Never worked for me. There is a guy in ebay who rebuilds the battery pack. for around $50 That is a good deal if you have all the tools in the kit. Otherwise I;d just replace the drill since it is not supported anymore. I have three battery packs and run them down and charge them regularily like and they last forever. But if you just leave them sit they go bad. One thing I did on an old pack I had was to buy a $14.00 1.5AH replacement battery from Harbor freight. I took it apart and ran the power wires to the connector then glued the connector to a plastic plate in the delta battery. Took about 1/2 hour Now the battery charges fine but doesn't last as long as the original 2AH battery. But for $14 No big deal. Another thing you don't ever want to do with these chargers is leave a battery in it chargind. When charge, just remove the pack. Lots of trouble. the new drills are smaller lighter and pack mor power. Maybe time for a new one. I just like to tinker.

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It's likely the battery. .. do a quick recharge to the battery using leads to a car battery. . A quick spark cleans the iods within the rechargeable battery which is just a series of batteries linked together. .. any dirty contact prevents recharging. .. after a quick spark. . place the newly cleaned battery on its charger and it should start charging.

Posted on Aug 24, 2015

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I have the same problem, and I find out that one of the resistor was loose and getting really hot and burning the board. I'm not sure whats the value of it, because the colors got erase. I hope this can be replace and hopefully it works....

Posted on Aug 24, 2015

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Well i have had the exact same problem, i plug in the charger and the yellow power light comes on
i slide in the battery and all lights go dead as if in the precharge mode but as above it never ever goes into charge mode . the last time i went to use this kit i was able to slide the battery back and forth on the charger until the yellow red combo , indicating chareg came on very tedious tho. this seems like a reasonable recall item if you ask me, does anyone know of the fix for this?

Posted on Jan 14, 2015

  • Stephen Jan 14, 2015

    Your readings are correct for the charger. Your battery thermistor is probably bad. 100kohms. I just received one of these from a friend who wanted me to look at it. As your looking at the charger contacts, with neg lead on right , pos lead on left should be around 25-27 volts. Then move pos lead to center and should have around 7 or so. This is a good charger. Both of these batteries were bad. 1 had the thermistor open (which is why I know it is a 100kohm, cause the other one was good. Some other brands use a 10k thermistor in the battery. If the thermistor is open, it will not start the charger. To check the thermistor, as your looking at the battery contacts, put the meter leads in the middle and the right contacts. It will read under 100kohms (varies with temperature). If it is open , the charger will not turn on. Both of these batteries had several bad cells, which I replaced and it works great now. Charger turns green in 45 minutes. Hope this helps.

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Check to see if the battery contact in side of the battery pack is lose. my charger burnt one of mine into on both batteries.

Posted on May 22, 2011

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