Wots been Happening in 101 World

Some alternators will self-excite from residual magnetism, although this is quite rare. The diodes fitted to alternators usually require much more voltage to conduct than is available from residual magnetism. So the small amount of current from the warning lamp is the only reliable way of starting an alternator which is designed this way. Many years ago Valiants used to feed their external regulators from the ignition switch so no excitation globe current was needed. I haven't seen another alternator like this for aeons.

on the case with that one only have a 1/2 hour window a day gone pvc pluming stuff so far so good problem running out of room under there
as all 101 and landy stuff the little jobs take forever learning new plumbing skills will let you know could be good for you driving trucks to melb on sunday hope to have it ready for all british day good luck with the electrics
:):):)

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Originally Posted by Lotz-A-Landies

Not sure I can agree with you about the 24V exciter current powering up a secondary 12V system.

The use of the relay is to electrically isolate both systems otherwise you have the 24V and 12V systems electrically connected.

Using a relay is also what the Australian Army does in it's 12V/24V SIII FFR.

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Using a 24 volt globe on the indicator light from a 24 volt supply which has a higher resistance than a 12 volt globe which excites the altenator gives the same effect as it would a 12 volt supply.
the two systems would still be isolated as we are only talking about the current to excite the altenater.
A relay can be used, but in a post above....keep it simple ?
If the altenator which Garry was using had a voltage sensing wire needing to go back to the battery or ignition, it would be a different story.
The standard older type Bosch with internal reg should have a main out put terminal and then a male spade connection L for exciter supply from ignition though a globe.


D+ connection is used on very old bosch altenaters which use a external reg.and the other end of that external reg is connected to igntion.

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Originally Posted by 101 Ron

<snip>
D+ connection is used on very old bosch altenaters which use a external reg.and the other end of that external reg is connected to igntion.

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The D+ terminal is/was present on the brand new internally regulated Bosch 85A alternator I purchased three weeks ago.

Although I will admit it is the type for Holden red/blue/black straight sixes through to the 1990's.

https://www.aulro.com/afvb/images/im...010/08/639.jpghttps://www.aulro.com/afvb/images/im...010/08/640.jpg
70 Amp BXH1238A Bosch ------------- 55 Amp BXH1236A Bosch (both internally regulated)

Garry just found a little bit of info you may be interested in: 2 Watt Bulb: The warning light used with Bosch Alternators should not exceed 2 Watts.

In the schematic below the internally regulated terminal "Ind" is synonymous with "D+" on the images above.
https://www.aulro.com/afvb/images/im...010/08/641.jpg

Thanks for that Diana - great stuff.

I did some checking today - the main power lead as expected goes direct from the alternator to the battery with no diversions. As I indicated there is a second smaller lead that also comes off the same point on the alternator but it does not go to any relay or the 24v battery pack but it also just goes back to the +ive side of the 12v battery along with the main heavy cable.

So there is no external exciter to my old alternator - so it must have been self exciting as it did work. I now wonder if the internal regulator had some part in this as when I replaced the internal regulator with a new one the alternator did not work.

Anyway that is old information now. When I put in my new alternator I will only connect the high amp cable direct to the battery. I will take 12v from a spare terminal on the relay that provides power to the ignition and send it to a 2w light and then back to D+ on the alternator.

Cheers

Garry

Weather has been crap for the last few weeks but I did manage to put in the new alternator today - I had to modify the home made bracket that took a little while.

I rigged up a light off the ignition system relay and all works well - volt meter shows 14v and light goes out with a little revs.

I still have no idea how the old alternator coils were being excited. It was a Bosch alternator off a sigma and should have been excited by a dedicated 12v lead but it did not have one (I have searched in case I have missed something). The only cables to it were from the battery and to the main connector on the alt.

Anyway - I have the alt in and have the ignition light I was after. Thanks to everyone for your help.

Cheers

Garry

Gday all

Thought it was about time i added something to this thread.
have fitted the locker to the rear diff, straps and tools to the front, as i cant find a pintle at the moment ive fitted a hook that came from another landy. also my son fitted a gun for protection.:). also picked up 4x alliance 9.00/16 tyres for $60 the lot:eek:. as u can imagine im still getting over the shock.
Cheers gaz

Wow what a great price on the tyres! Bet you are pleased?

Do you now need a Police Commissioner's prohibited weapons licence for the toy machine gun? :(

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Originally Posted by DODGE

Gday all

as i cant find a pintle at the moment ive fitted a hook that came from another landy.

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There are some light weight bolts that hold on the front bumper/cross member so I would ensure that none are corroded before you used the hook.

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Originally Posted by DODGE

also picked up 4x alliance 9.00/16 tyres for $60 the lot:eek:. as u can imagine im still getting over the shock.
Cheers gaz

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Why don't things like that happen to me - you lucky bugger. Where did you get them.

Garry

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Originally Posted by DODGE

Gday all

Thought it was about time i added something to this thread.
have fitted the locker to the rear diff, straps and tools to the front, as i cant find a pintle at the moment ive fitted a hook that came from another landy. also my son fitted a gun for protection.:). also picked up 4x alliance 9.00/16 tyres for $60 the lot:eek:. as u can imagine im still getting over the shock.
Cheers gaz

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For some strange reason, I find pintles often. How much is your budget and I'll let you know when I find one.