Battery charger shorts out?
in [Car Maintenance]
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From: redwood on 2 Dec 2006 15:44 "Ivan" <Ivan'H'older(a)yahoo.co.uk> wrote in message news:Jflch.10628$k74.9170(a)text.news.blueyonder.co.uk... > > "redwood" <help(a)nooos.com> wrote in message >> Got the rectifier from my local Maplins and is now fitted. It's twice >> the size of the original with bigger spade connectors so had to >> replace >> the ends of the 4 wires. It was a bit confusing knowing which way >> round >> the - wires go as the only markings on the new rectifier only >> displayed >> on one side showing the AC & +. Going round in a clockwise >> direction, >> if the 1st terminal is AC+, the 2nd terminal is DC+, I connected the >> 3rd terminal to AC-, and the 4th terminal to DC- > Most bridge rectifier are usually marked: ~ ~ (ac in) + - (dc out). Looked all round using a magnifying glass but the only marks I could find were on one edge similar to this pic http://www.kpsec.freeuk.com/photos/rapid/brect5.jpg
From: Andrew Gabriel on 2 Dec 2006 16:09 In article <Jflch.10628$k74.9170(a)text.news.blueyonder.co.uk>, "Ivan" <Ivan'H'older(a)yahoo.co.uk> writes: > > Most bridge rectifier are usually marked: ~ ~ (ac in) + - (dc out). IME, only the +ve is normally marked on the square ones. The -ve will be diagonally opposite, and the others are the AC (doesn't matter which way around). -- Andrew Gabriel
From: Ivan on 2 Dec 2006 16:25 "redwood" <help(a)nooos.com> wrote in message news:4te70eF12lurrU1(a)mid.individual.net... > "Ivan" <Ivan'H'older(a)yahoo.co.uk> wrote in message > news:Jflch.10628$k74.9170(a)text.news.blueyonder.co.uk... > > > > "redwood" <help(a)nooos.com> wrote in message > >> Got the rectifier from my local Maplins and is now fitted. It's twice > >> the size of the original with bigger spade connectors so had to > >> replace > >> the ends of the 4 wires. It was a bit confusing knowing which way > >> round > >> the - wires go as the only markings on the new rectifier only > >> displayed > >> on one side showing the AC & +. Going round in a clockwise > >> direction, > >> if the 1st terminal is AC+, the 2nd terminal is DC+, I connected the > >> 3rd terminal to AC-, and the 4th terminal to DC- > > > Most bridge rectifier are usually marked: ~ ~ (ac in) + - (dc out). > > Looked all round using a magnifying glass but the only marks I could > find were on one edge similar to this pic > http://www.kpsec.freeuk.com/photos/rapid/brect5.jpg > Are the other two terminals on the other side of the rectifier similarly marked AC & - ? ....if so then it's simply a matter of the mains transformer connecting to the two terminals marked AC and the ones marked + & - eventually finding their way to the respective battery terminals.
From: David Taylor on 2 Dec 2006 16:30 On 2006-12-02, redwood <help(a)nooos.com> wrote: > "Ivan" <Ivan'H'older(a)yahoo.co.uk> wrote in message > news:Jflch.10628$k74.9170(a)text.news.blueyonder.co.uk... >> >> "redwood" <help(a)nooos.com> wrote in message >>> Got the rectifier from my local Maplins and is now fitted. It's twice >>> the size of the original with bigger spade connectors so had to >>> replace >>> the ends of the 4 wires. It was a bit confusing knowing which way >>> round >>> the - wires go as the only markings on the new rectifier only >>> displayed >>> on one side showing the AC & +. Going round in a clockwise >>> direction, >>> if the 1st terminal is AC+, the 2nd terminal is DC+, I connected the >>> 3rd terminal to AC-, and the 4th terminal to DC- > >> Most bridge rectifier are usually marked: ~ ~ (ac in) + - (dc out). > > Looked all round using a magnifying glass but the only marks I could > find were on one edge similar to this pic > http://www.kpsec.freeuk.com/photos/rapid/brect5.jpg The terminal marked AC is one AC connection, the other AC connection goes to the corner diagonally opposite. The terminal marked "+" is the DC+, the terminal opposite that is DC-. -- David Taylor
From: Duncan Wood on 2 Dec 2006 19:31
On Sat, 02 Dec 2006 17:43:42 -0000, Sylvain VAN DER WALDE <sylvain.vanderwalde(a)which.net> wrote: > > "Duncan Wood" <newsto(a)dmx512.co.uk> wrote in message > news:op.tjxupjhyyuobwl(a)lucy... >> On Sat, 02 Dec 2006 15:20:13 -0000, redwood <help(a)nooos.com> wrote: >> >>> "Andrew Gabriel" <andrew(a)cucumber.demon.co.uk> wrote in message >>>> S4VB is a 4A bridge rectifier, and the 10 means 100V working. >>>> >>>> A 10A or higher (50V or higher) bridge rectifier will be fine. >>>> (A 4A bridge rectifier was obviously inadiquate.) >>>> I would also get some heat sink compound to smear between the >>>> new rectifier and the heatsink. >>> >>> Got the rectifier from my local Maplins and is now fitted. It's twice >>> the size of the original with bigger spade connectors so had to replace >>> the ends of the 4 wires. It was a bit confusing knowing which way >>> round >>> the - wires go as the only markings on the new rectifier only displayed >>> on one side showing the AC & +. Going round in a clockwise direction, >>> if the 1st terminal is AC+, the 2nd terminal is DC+, I connected the >>> 3rd >>> terminal to AC-, and the 4th terminal to DC- >>> >> >> That should be right. >> >>> I've not yet tried it connected to a battery but it now powers on >>> without clicking and connecting a DVM to the croc clips shows around >>> 12.06v or 6.02 on the 6 volt setting. I shall give it a test on a >>> battery tomorrow. >> > Is your meter reasonably accurate? > These voltage readings seem rather low. > > Sylvain. > > If there's no battery connected it'll be trying to measure a non-dc waveform, how it does this will give a somewhat arbitrary result. |