alternators

[flyingbrick]

Are there different alternators for 12 and 24v?

Just opened the one that came with my v8 as it was making some funny sounds and it turns out the shaft is bent (inside the unit, how the hell?)

So does nissan sell a higher amp alternator than is normal and what model has it.

I know nothing about the things at all.

-Nathan

[sibainmud]

12 & 24 are different, has to do with the amount of windings, let alone the regs and so on. If you get a good one to replace it, it maybe worth thinking about an after market external reg, that can work the alt a bit harder or they have adjustable parameters.
We do this with boats all the time, especially yachts that want maximum charge in a short time. The automotive internal regs are a bit passive for this. Main hurdle is that a good external reg with adjustments are up to $500 or even more
Hope this helps in some way.
Cheers.

[flyingbrick]

thanks for that.

What are the cons of going for a large alternator over a smaller amp one?

[Madaz]

Go see Tony at speedylube. the alternators he running in his truck are what you want and they wernt that expensive either

[flyingbrick]

Thanks Tim.

I'll go see Tony.

Hope you are well etc.

-Nathan

[safarifern]

I have upgraded to a 75 amp alt in my safari due to running a house marine battery at the back (stand alone 12V system). They come standard @ 35 amp. You can pick one up on TM (pick up Rotorua or post). Straight swap easy as!

Things you need to know before buying:

1: Make sure you run a 8 G cable or above from back of alt to battery (fused at 50Amps) Reason is that the wiring can't handle above 35 amps and you will get a volt drop, and you could burn out wiring!. Cost around $25 ish.

2: I had problems turning her fast at idle. She would only give full power at 1200 RPM. Fix ... smaller pulley, got down to 800 RPM and going to do my injectors soon, should give me another 200 RPM fingers crossed! So should get full power at 600 RPM idle so I can charge without going anywhere ... great for camping. Cost, find a good mate that has a lot of pulleys and choose the best

I keep meaning to put up my 12V system set up on ORE, maybe next week ... so you can see some photos.

Any questions give us a shout

[Madaz]

Yep sweet as,

Flat out prepping hilux for tough truck comp, before work starts up again.

Think my Dad probally has a vh45 alternator kicking around sumwhere if all else fails.

Cheers

[sibainmud]

As a suggestion,
My Terrano comes with a factory 70amp @12 volt alt. With the standard N70 battery in the engine bay, after 3 lengths of rope it was flat, so to over come this, I installed a N120 battery in the back over the rear axle and ran 70mm cable for both positive and negative to the front. This big battery I configured to be dedicated start, winch and glow plugs, with the little battery doing everything else. The charging system was simple with the use of a VSR (voltage sensitive relay). The only changes I had to make to over-come the volt drop over the whole length of the truck was to run a 1mm wire from the rear battery to the sense terminal on the alternator, and configure it to charge the rear battery first, to replace the power used for winching asap. Now I have 7 lengths of string before it goes flat
When camping last weekend, I ran the whole camp site off my truck. We had 240 volt lights, 12 volt tv's (x2), two dvd players and everyone was charging cell phones too, all at the same time without the engine running. In the morning, it started easy peasy
I just used the years of experience with boats to keep it simple but very usable. I used all the right size wire and fused it in all the right places.
Works for me.

Cheers.

[flyingbrick]

thanks guys! info like this makes ORE great!

Another question. With the old setup and factory winch my lights used to dim when under heavy load on even the first pull.

What causes this? eg, batterys that can not supply enough current, wiring, ????


Thanks Tim, will keep your dads in mind.

[sibainmud]

thanks guys! info like this makes ORE great!

Another question. With the old setup and factory winch my lights used to dim when under heavy load on even the first pull.

What causes this? eg, batterys that can not supply enough current, wiring, ????

All of the above cause it. That's why two separate batteries works well for me

[flyingbrick]

thanks dude, you rule

[flyingbrick]

http://cgi.ebay.com/ebaymotors/250-AMP- ... 1331wt_732

peoples opinions on this here.

[sibainmud]

Mate that is a huge output
When I have set up 120 amp Bosch alts with serpentine belts the belt can't cope with the load. If you run V belts, then I would personally recommend running 2x "A" section (13mm) belts minimum, to run one of that size.
Looks good tho.
You'll have to work out the physical size and "shoe horn" it in

[flyingbrick]

i found a page of dimensions. Its like the same size as my engine so will stay clear.

Will use a more normal one

[safarifern]

As a suggestion,
My Terrano comes with a factory 70amp @12 volt alt. With the standard N70 battery in the engine bay, after 3 lengths of rope it was flat, so to over come this, I installed a N120 battery in the back over the rear axle and ran 70mm cable for both positive and negative to the front. This big battery I configured to be dedicated start, winch and glow plugs, with the little battery doing everything else. The charging system was simple with the use of a VSR (voltage sensitive relay). The only changes I had to make to over-come the volt drop over the whole length of the truck was to run a 1mm wire from the rear battery to the sense terminal on the alternator, and configure it to charge the rear battery first, to replace the power used for winching asap. Now I have 7 lengths of string before it goes flat
When camping last weekend, I ran the whole camp site off my truck. We had 240 volt lights, 12 volt tv's (x2), two dvd players and everyone was charging cell phones too, all at the same time without the engine running. In the morning, it started easy peasy
I just used the years of experience with boats to keep it simple but very usable. I used all the right size wire and fused it in all the right places.
Works for me.

Nice setup ... oh I wish i have a 12V truck sometimes, with VSR it makes things so much simpler

[sibainmud]

You can get 24 volt vsr's
Cheers.

[safarifern]

Yea I know, but the price of some 24v accessories out weighs the cost of the 12 v setup, also quite hard to find some accessories that will come 24v, try finding a 24v HF radio! Plus another battery, space the list goes on ....

[flyingbrick]

realized that the alternator ive got (but is broken) is 110amp- more than large enough for me, so I'll keep looking for an identical replacement. Also means my loom plugs etc will not need changing.

Has anyone taken the time to rebuild an alternator? On this particular unit I can see no way to put it back together. I can't for the life of me see how to retract the brushes and hold them out until the rotor is back in its place.

I wanna use it as a dummy one to make some brackets up.

[meatc]

I do mine after after every W/C event, 2 of them after rotorua

In the bottom/back of the housing under where the brushes sit there will be a little bung, pull it out, and use a small wire or drill bit, push the brushes back and use the wire to hold them in , put the armeture back and then pull the pin. ( there are likely to be holes in the brushes for the pin)

[flyingbrick]

shit, thanks tons!