Les Brock Posted June 30, 2006 Share Posted June 30, 2006 Well, being fed up of split charge systems not working to there full potential and burning out several, I've gone for twin alternators as many know I have air con pump for the on board air system which has twin pulleys already, so it was'nt going to be as straight forward as sticking it where the pump normally sits...as errrr... its there already so knock up a bracket becase the legs are the same distance apart on both the alternator and pump ! so here it is, 6mm plate, Nige would be pround....well maybe not the welding, but the penetration is there, but the welder was playing up and wire kept sticking !!!!...well thant's my excuse Bracket in place, I used M10 Zeb for the mounts, so no faffing with two spanners to adjust as they lock into place and can't turn Pics of the Alternator mounted The alternator in the normal position is a 120 Amp one so this will become the Winch battery (just route the W and sense cable to the other side of the block), and the new one the rest of the truck How many belts.......... The adjuster was a bit of a head scratcher , as the alternator is lower than the far mounting hole on the pump, the solution works very well but pretty it ain't (putting heat shrink over to hide it) basically its a length of M10 stainless threaded rod, with "T" M10 joiner, one section is drilled out and the bar passess through it, the other plane, bolts to the mounting hole on the Alternator which allows it to change angle, and two nuts on the trheaded bar which you use to tention the belt and lock into place...and yes...its been cut right back and covered so it don't take yer eye out.. Working on a prettier version The wiring is pretty simple, new 25mm feed to the battery position, battery sense via the 24 Volt altenator lamp in the dash (military) via relay switched from the normal ignition circuit, so the sense cable is only connected to the alternator with the ignition on fitted a link switch in the battery box, so If one alternator packs up, close the link switch and the two will charge from the one good alternator to get you home So there you go.... Just the rest to do now Quote Link to comment Share on other sites More sharing options...
Snoopy Posted July 2, 2006 Share Posted July 2, 2006 Les, Thank you for posting this, you have saved me a great deal of head scratching on how I was going to mount a second altenator on my discovery for this purpose. Just a quick question, do you know off hand the reference for the belt form the aircon pump to the altenator? Thanks again. Tony '86 110V8i CSW '93 Discovery V8i GS '96 Discovery V8i ES Quote Link to comment Share on other sites More sharing options...
Les Brock Posted July 2, 2006 Author Share Posted July 2, 2006 Tony, Glad it was usefull to someone as least, I bought two belts at the same time, I'll check the number and post it later Quote Link to comment Share on other sites More sharing options...
simonr Posted July 2, 2006 Share Posted July 2, 2006 Particularly like the tensioner! Si Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted July 3, 2006 Share Posted July 3, 2006 Well, being fed up of split charge systems not working to there full potential and burning out several, I've gone for twin alternators Good man! just like i did! as many know I have air con pump for the on board air system which has twin pulleys already, so it was'nt going to be as straight forward as sticking it where the pump normally sits...as errrr... its there already A problem i'll be having, except that my pump is one of the square York ones... space will be very limited! The wiring is pretty simple, new 25mm feed to the battery position, battery sense via the 24 Volt altenator lamp in the dash (military) via relay switched from the normal ignition circuit, so the sense cable is only connected to the alternator with the ignition on Done properly as well!!!!! 11 out of 10!!! B) Quote Link to comment Share on other sites More sharing options...
imspanners Posted July 6, 2006 Share Posted July 6, 2006 If you don't mind me making a suggestion Les, Looks good BTW..... How about turning the front face of the alternator around 120degrees? That would put the current adjuster bolt hole in line with the rear mounting hole, and the mounting hole would become the adjuster underneath the alternator. You could then run a ring with thread on from the air pump mounting plate, using your T piece with a straight piece of rod? Still with me? Quote Link to comment Share on other sites More sharing options...
Tonk Posted July 6, 2006 Share Posted July 6, 2006 agree it would look better engineered i'm still tryin to work out if i can have two alternators, stay on 12 volts and only have one battery Quote Link to comment Share on other sites More sharing options...
was a nice truck? Posted July 6, 2006 Share Posted July 6, 2006 My challenge truck runs two alternaters on 2 batteries in parallel and wots more the alternaters are different sizes and makes. Total charge 155 amps. Now I realize about two dozzen people who know more about these things than i do will tell me it wont work-last. However in my expieirence (you cant have too many i,s) it does work very well. Davew Quote Link to comment Share on other sites More sharing options...
Tonk Posted July 6, 2006 Share Posted July 6, 2006 so have u just paralleled everything up? batteries and alternators and exciter circuits? Quote Link to comment Share on other sites More sharing options...
Les Brock Posted July 6, 2006 Author Share Posted July 6, 2006 Turning the front plate..... Do-oh ! Never thought of that , I'm on holiday next week to put the whole truck back together, I'll give it a go... I did say it was'nt pretty, practical....but orrible Quote Link to comment Share on other sites More sharing options...
was a nice truck? Posted July 6, 2006 Share Posted July 6, 2006 batts and alts in parallel original exiter as was and extra exiter on its own charge light but fed from same place as original, so to recap yes ,I did think the exciters were seperate but thinking as i type they are not. One day i will find some one with a big ammeter and do some tests to see what is chargeing when as i think one charges and one shuts down unless sensed volts are loww ie when winching when both alts will be banging out charge i hope. Batts seem to last well under winching however. Dw Quote Link to comment Share on other sites More sharing options...
Tonk Posted July 6, 2006 Share Posted July 6, 2006 so u have 2 charge lights on the dash? if so they have they're own exciter circuits? i might have to experiment cheers for the info Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted July 6, 2006 Share Posted July 6, 2006 Les, Just the one visit to me workshop and you got infected with 6mmminimumplate syndrome Uncurable Nice work - is there going t6o now be a Mk2 version ? Nige Quote Link to comment Share on other sites More sharing options...
was a nice truck? Posted July 6, 2006 Share Posted July 6, 2006 Yup two seperate charge lights, and they both go out one always slightly slower than the first. DW Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted July 7, 2006 Share Posted July 7, 2006 i'm still tryin to work out if i can have two alternators, stay on 12 volts and only have one battery The military Wolf FFR's have twin alternators, along with a unit that joins them together to give one large output (not like the old 90/110' FFR's that had two separate circuits) it's a "RRC8643 Twin alternator control unit" you see them on eblag sometimes. although they are 24v, i'm not sure what's in them, probably just a type of blocking diode, but working in reverse, two inputs, one output but each alternator blocked by the diode to stop current feed-back. Quote Link to comment Share on other sites More sharing options...
Tonk Posted July 7, 2006 Share Posted July 7, 2006 The military Wolf FFR's have twin alternators, along with a unit that joins them together to give one large output (not like the old 90/110' FFR's that had two separate circuits)it's a "RRC8643 Twin alternator control unit" you see them on eblag sometimes. although they are 24v, i'm not sure what's in them, probably just a type of blocking diode, but working in reverse, two inputs, one output but each alternator blocked by the diode to stop current feed-back. cheers, i'll have a search Quote Link to comment Share on other sites More sharing options...
Shaun D Posted July 12, 2006 Share Posted July 12, 2006 Got two alternators on my G-reg Disco 3.9EFI (it's a long story ok?) one 65 Amp, one 80Amp and two batteries, one each side of the rad (12Volt) all in parallel. Had a problem with one warning lamp flickering, turned out to be a faulty regulator on one of them, fitted a new one, no problems since. You need two warning lamps, I used the brake pad wear lamp as the second one on mine as the system had been half ripped out by the previous owner anyway. There is no problem with doing this, just bear in mind that they don't load share unless they are absolutely identical. What happens is you run on just one (the one with the highest voltage) and the other one is effectivelya backup for when the load is high. When I start winching they both get Bl**dy hot so I know they're working . It's excellent for jumpstarting dead vehicles as well. What I also did was run the output wire from the second unit to the second battery so there is a bit of resistance between the two (so they don't "see" each other too much, if you get what I mean). When I changed engines the old one was a 3.5 with the alternator on the driver's side the new one was early 3.9 with the alternator on the passenger side, so I just used both sets of brackets and the 3.5 water pump, as a result it's all Land Rover . Hope this helps someone, Shaun Quote Link to comment Share on other sites More sharing options...
Tonk Posted July 12, 2006 Share Posted July 12, 2006 i'm planning on using 2 bosch units both at 95 amp iirc, just need to find room in the engine bay for the second one Quote Link to comment Share on other sites More sharing options...
SOA 93 Posted July 16, 2006 Share Posted July 16, 2006 i'm planning on using 2 bosch units both at 95 amp iirc, just need to find room in the engine bay for the second one Some of you might find this tech a little useful: http://www.adverc.co.uk/technical/technical-twin.asp Good website generally worth a visit. Andy Quote Link to comment Share on other sites More sharing options...
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