whitestu
|
| posted on 6/6/08 at 09:49 AM |
|
|
Nippon Alternator Wiring
I'm still trying to get my alternator light to work, but am now stuck.
The alternator works fine and is charging, but the only way to control the light as far as I can see is through a low power 12v output from the right
hand pin in the pic. The middle pin is 12v switched from the ignition, and the left hand pin isn't used.
Basically when the alternator isn't running I get 12v from the rh pin. When it is running this drops off to 0v.
To get the light on my Acewell to work I need to earth it.
So I think I need a very low power relay that uses the signal from the alternator to switch the light to earth.
I've tried a small reed relay from Maplins, but there isn't enough power in the signal from the alt to activate the relay.
Has anyone succeded in getting this to work?
Thanks
Stu
 
Nippon alternator
|
|
|
|
|
iank
|
| posted on 6/6/08 at 09:53 AM |
|
|
Hopefully this should help. You shouldn't need a relay to light the charge light.
http://www.westfield-world.com/daihatsu_alternator.html
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
|
|
|
whitestu
|
| posted on 6/6/08 at 09:57 AM |
|
|
Thanks
I've been through all the previous posts and diagrams I can find and non are the same as mine. The 4 wire alternator diagram in the link must
switch to earth which mine doesn't do.
None of them explain how the ignition light actually works, so I'm still stuck.
Cheers
Stu
|
|
|
jabbahutt
|
| posted on 6/6/08 at 10:25 AM |
|
|
I had loads of fun trying to figure this out and read every post I could find
see next post as I completely screwed this one up.
apologies
[Edited on 6/6/08 by jabbahutt]
|
|
|
whitestu
|
| posted on 6/6/08 at 10:31 AM |
|
|
Thanks Nigel
Just to clarify, you have a wire coming from the 12v pin on the alternator to the light and then to earth?
On my Acewell, the ignition light needs to be put to earth to switch the light on so I don't think I can wire it like that.
Stu
|
|
|
jabbahutt
|
| posted on 6/6/08 at 10:38 AM |
|
|
sorry humble apologies
I've just looked at my notes and I'm talking absolute rubbish (as usual)
The lamp on the dash is fed from the alternator on one side and a switched positive on the other.
When alt off the switched positive flows through light to alternator and so light up as pin on alt should be at 0v
When alt runs no potential difference so no current flows through lamp as 12v either side.
Sorry about other post , that's what happens when you try and post on here and work at the same time
Nigel
[Edited on 6/6/08 by jabbahutt]
|
|
|
whitestu
|
| posted on 6/6/08 at 10:43 AM |
|
|
Thanks
I still can't see how I can get that to work with my Acewell as it still needs the lamp output to be earthed to give a circuit.
The supply to the lamp comes from the Acewell unit and is also used for the oil pressure light, so the only way to put the alt light on is to earth
it.
Stu
|
|
|
02GF74
|
| posted on 6/6/08 at 11:38 AM |
|
|
quote:
Originally posted by whitestu
I've tried a small reed relay from Maplins, but there isn't enough power in the signal from the alt to activate the relay.
which relay or more importantly do you know coil resistance so an work out the current?
lowest power i havr found so far is
1A DPDT 12Vdc N04AW
that needs 17 mA. £ 1.91
and
2A DPDT12Vdc LtchRly N38AW 90 £ 3.73
needs 15 ma
stupid quesiton but did you wire it uo correctly?
if yes, then you would need to amplify the current or see hom much current the alternator can sink configuration 2 below.
1. alt sources current:
pin 3 alt ------- coil -------- 0 V
2. alt sinks current
pin 3 alt ----------- coil ------- 12 V
with the latter, would with need a 2 way relay and the 12 V would need to be swtiched.
in the diagrams on the westfiled forum post - whcih pin are you refering to?
|
|
|
whitestu
|
| posted on 6/6/08 at 11:57 AM |
|
|
This was the relay I tried:
 
I tried it using a feed directly from the battery and it worked so it was wired correctly. I'm not sure how much current it needs.
The pins on mine are P [not used]; ig [switched 12v] and L [ign ition light].
Mine appears similar to the 4 connector alternator b on the Westy forum where the guy says the alternator light didn't work.
Stu
|
|
|
02GF74
|
| posted on 6/6/08 at 12:20 PM |
|
|
the 500 ohm is coil rsistance = equates to 24 mA so in similar ball park as the realys I posted about so unlikley to work.
you have 2 options.
1. see if the alternator will sink current - as in 2 above - but without knowing the output circuit in the alternator, there is risk of damaging
it.
2. fit a voltage sensitive circuit.
a 12 V logic inverter would do that and sink current for the display lamp. or a transistor to amplify the current but that would need more
components.
you would need to make a cicruit for that.
use 4001 QX01B 193 for a mere £ 0.57
|
|
|
whitestu
|
| posted on 6/6/08 at 12:41 PM |
|
|
Thanks
I'm amazed it is so difficult to get the ignition light to work, unless I'm missing something obvious.
Stu
|
|
|
02GF74
|
| posted on 6/6/08 at 01:14 PM |
|
|
... so anyone got the wiring diagram for a car with this alternator fitted?
this may give clues.
it's probably no surprise - he alternator was designed to fit a specific car whcih had the approapriate electrics for the lamp.
|
|
|
whitestu
|
| posted on 6/6/08 at 01:15 PM |
|
|
It's actually a tractor alternator I think.
stu
|
|
|
DRC INDY 7
|
| posted on 6/6/08 at 05:28 PM |
|
|
I have the very same alternator that you have and had the same trouble i just gave up in the end and fitted a volt gauge
https://www.facebook.com/groups/462610273778799/
Puddle Dodgers Club
|
|
|
Macbeast
|
| posted on 6/6/08 at 05:50 PM |
|
|
I don't see the problem. When the alternator is stationary, the lt pin falls to 0V which is effectively earth. So your Acewell sees an earth
when the alternator is not running.
|
|
|
whitestu
|
| posted on 6/6/08 at 07:44 PM |
|
|
quote:
I don't see the problem. When the alternator is stationary, the lt pin falls to 0V which is effectively earth. So your Acewell sees an earth
when the alternator is not running.
0v isn't the same as having an earth. Without an earth there is no circuit so no current flow.
I think I'll probably go with DRC INDY 7's suggestion and fit a voltmeter.
Stu
Stu
|
|
|
paulf
|
| posted on 6/6/08 at 08:53 PM |
|
|
I recently accidently connected the +12v supply to the alternator to the warning light output and now it no longer works so be carefull if
experimenting with it.it still charges though so I will be fitting a voltmeter i have spare.
Paul
|
|
|
Macbeast
|
| posted on 6/6/08 at 09:30 PM |
|
|
Oh sorry I misread - when the alternator ISN'T running you get 12V. How odd.
You could try an LED from the indicating pin through a 1.2K resistor to earth. The would take 10 mA but would be separate from the Acewell.
Or take a transistor - virtually any NPN transistor - and connect the base to your indicating pin, the emitter to earth and the collector to your
Acewell.
The signal from the alternator should turn the transistor hard on and present an earth to the Acewell
[Edited on 6/6/08 by Macbeast]
|
|
|
whitestu
|
| posted on 7/6/08 at 04:01 PM |
|
|
Thanks
I'll give the transistor a go.
Cheers
stu
|
|
|
.jpg)
