wiltshire landyman · May 16, 2013

been given this for my twin alternator setup

looks army issue to me but not sure,is there a way of telling if its 12 or 24v??

SmileySteve · May 16, 2013

Ex MOD colour, from body size I would say its 24V, additional windings within the casing makes it larger frame than even high output 12V units.

wiltshire landyman · May 16, 2013

SmileySteve said:
Ex MOD colour, from body size I would say its 24V, additional windings within the casing makes it larger frame than even high output 12V units.

the piece on the end with the output tube thing looks like its removeable

wiltshire landyman · May 20, 2013

have removed the end piece now so its normal 300 size now..how can I tell if its 24v?

lets say it was 24v im using this to charge the battery for my 8274 winch which has a bow 2 on it so it can handle over volting..but what will the battery do if 24v is put into it??

200tdi ayre · May 20, 2013

wiltshire landyman said:
have removed the end piece now so its normal 300 size now..how can I tell if its 24v?

lets say it was 24v im using this to charge the battery for my 8274 winch which has a bow 2 on it so it can handle over volting..but what will the battery do if 24v is put into it??

Die quite quickly

wiltshire landyman · May 20, 2013

200tdi ayre said:
Die quite quickly

so there must be 24v batterys that I can fit in me disco then?

that's assuming this alt is 24v ?

mundungus · May 20, 2013

Quite possibly boil.

Good chance your wires will also.

top-cat · May 20, 2013

wiltshire landyman said:
have removed the end piece now so its normal 300 size now..how can I tell if its 24v?

lets say it was 24v im using this to charge the battery for my 8274 winch which has a bow 2 on it so it can handle over volting..but what will the battery do if 24v is put into it??

Take the + of your main battery and connect it to the - of your winch battery, take the + of your winch battery to your winch and to your new 24v alternator, jobs a good un, 24 volt winch

mundungus · May 20, 2013

wiltshire landyman said:
so there must be 24v batterys that I can fit in me disco then?

that's assuming this alt is 24v ?

I think the lorries wire them in banks of two in series. Hopefully a lorry driver will be along soon to confirm or deny

mundungus · May 20, 2013

Is there a part number on it anywhere?

wiltshire landyman · May 20, 2013

mundungus said:
Quite possibly boil.

Good chance your wires will also.

wires should be fine its all been swapped to 70mm

200tdi ayre · May 20, 2013

mundungus said:
I think the lorries wire them in banks of two in series. Hopefully a lorry driver will be along soon to confirm or deny

I'm not 100% sure but I think this is how it works

top-cat · May 20, 2013

they are wired on lorrys as i said in post 8

Bump · May 20, 2013

mundungus said:
Quite possibly boil.

Good chance your wires will also.

double the voltage, half the current.

It's current rating which affects the wire size, not voltage - else you're wiring in your home would be the size of your arm.

If anything you can have smaller wire!

(V=IR)

wiltshire landyman · May 20, 2013

Bump said:
double the voltage, half the current.

It's current rating which affects the wire size, not voltage - else you're wiring in your home would be the size of your arm.

If anything you can have smaller wire!

(V=IR)

existing wiring melted with the draw of the 8274,70mm is used as ive extended the cutoff switchs into the cab so theres a longer run of cable

mundungus · May 20, 2013

wiltshire landyman said:
wires should be fine its all been swapped to 70mm

No it's not that.

When you're jump starting it, you get a big load of current draw for a short period of time. The wires might warm up (probably not yours as 70mm2 is bloody big) but will cool down once the starter stops drawing current.

You're talking about drawing a huge current continuously. With a common earth, you're talking about having a 24 volt source directly connected to a 12 volt source. That means you have a 12 volt difference over a piece of copper wire (very little resistance). Ohms law would suggest you're talking about a fecking huge current through them wires, until something catches fire or spews boiling acid all over your battery box.

All that said, I guess it also depends on the circuit inside the voltage regulator. If you're lucky, it might just not work at all.

top-cat · May 20, 2013

Bump said:
double the voltage, half the current.

It's current rating which affects the wire size, not voltage - else you're wiring in your home would be the size of your arm.

If anything you can have smaller wire!

(V=IR)

correct, although you wouldnt down size the cable now it fitted, no need,
My winch used to be 24v until i changed to a bow2, i didnt change the leads from the solenoid on the bulkhead to the winch (25mm2) they got very hot whilst winching but where fine on 24v. I used to have a pair of solenoids wired so as the batteries where in parrallel most of the time (12v) and in series when winching (24v)
I will probably redo the 24v system so i can have fast spool winching when required, as mentioned the bow 2 will handle it

Bump · May 20, 2013

mundungus said:
All that said, I guess it also depends on the circuit inside the voltage regulator. If you're lucky, it might just not work at all.

Yeah 24v connected to voltage regulator, connected to 12v battery would do it

wiltshire landyman · May 20, 2013

mundungus said:
No it's not that.

When you're jump starting it, you get a big load of current draw for a short period of time. The wires might warm up (probably not yours as 70mm2 is bloody big) but will cool down once the starter stops drawing current.

You're talking about drawing a huge current continuously. With a common earth, you're talking about having a 24 volt source directly connected to a 12 volt source. That means you have a 12 volt difference over a piece of copper wire (very little resistance). Ohms law would suggest you're talking about a fecking huge current through them wires, until something catches fire or spews boiling acid all over your battery box.

All that said, I guess it also depends on the circuit inside the voltage regulator. If you're lucky, it might just not work at all.

so how do I tell if alt is 24v??? it was given to me but if theres no way of testing I will just get another 100amp 300 tdi alt

Bump · May 20, 2013

wiltshire landyman said:
so how do I tell if alt is 24v??? it was given to me but if theres no way of testing I will just get another 100amp 300 tdi alt

Wire it up to the engine and stick a multimeter on the output?

Or... just rig up a motor to spin it to test it. (old starter motor or something?)

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