Ham
|
| posted on 17/3/06 at 11:14 AM |
|
|
Alternator wiring
I have almost completed my wiring loom and am stuck with one item left - the alternator. The book diagram shows a diode connected in series between
the Alternator and the alternator light.What diode do I use,can I conect it to the light itself or is it included in the alternator regulator circuit
- The engine is a X flow with standard ford alternator.
Help will be greatly appreciated
|
|
|
|
|
02GF74
|
| posted on 17/3/06 at 11:40 AM |
|
|
quote:
Originally posted by Ham
I have almost completed my wiring loom and am stuck with one item left - the alternator. The book diagram shows a diode connected in series between
the Alternator and the alternator light.What diode do I use,can I conect it to the light itself or is it included in the alternator regulator circuit
- The engine is a X flow with standard ford alternator.
Help will be greatly appreciated
what book are you referring to?
assuming you are on about the charge lamp, are you sure it is a diode?
is it ford alternator? (from meomory Lcuas and Bosch + 1 other type were fitted to mk2 escort)
a diode should not be necessary and if there was one, then it should be as below. It will allow current to go to the filed winding when the alt is
not producing power and the lamp lights. When there is output from the alternator, the current will stop flowing and the lamp goes off. It will not
show overcharinging though, a rare problem.
the -|>|- is the diode.
12 V --(lamp)--|>|--[alt]
I have not come across any external diodes on any alternator up to now.
|
|
|
Ham
|
| posted on 17/3/06 at 12:02 PM |
|
|
I am refering to the "build your own sportscar for a ton of cash and race it!!"
I am unsure what alternator I have but there are two connections from the back of the alternator a large spade connector and a small connector, I
presume the large connector is the main output to the battery and the small connector to the charge light, as mentioned the book clearly shows a diode
in the circuit, hence the confusion??
Thanks for the help
|
|
|
RazMan
|
| posted on 17/3/06 at 12:09 PM |
|
|
The diagram that Pole volt have here doesn't show a diode but explains how the
light works - both alternator and charge light are connected to +ve feeds and the alternator takes it signal to charge (or not) from this.
The diode you have in your diagram might be a safeguard against the alternator draining the battery while the ignition is switched off (just an
idea)
[Edited on 17-3-06 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
|
|
|
BKLOCO
|
| posted on 17/3/06 at 12:25 PM |
|
|
Alternator wiring is very simple but often made unnecessarily complicated.
The big terminals on the alternator marked B+ (may be 1 or 2) are both connected directly to the battery.
The little terminal marked D+ goes to the ign light the other side of which goes to a live ign switch feed.
The reason for this feed from the ign switch is to provide excitation to the field windings the lamp in circuit is a visual indication to show the
driver that the alternator is outputting.
There is sometimes another terminal on the alternator marked + this is purely for connection of an interferance suppression capacitor to ground.
You need no external components ie. diodes on modern alternators. all rectification and regulation is done internally.
Experience is what you get when you don't get what you want!!! 
|
|
|
rusty
|
| posted on 17/3/06 at 12:55 PM |
|
|
The diode is often built in to the back of the dash clocks.
Oh also our Toyota unit has 4 connections so thrink yourself lucky.
|
|
|
02GF74
|
| posted on 17/3/06 at 02:05 PM |
|
|
quote:
Originally posted by RazMan
The diode you have in your diagram might be a safeguard against the alternator draining the battery while the ignition is switched off (just an
idea)
For that to be the case, the diode would need to be the other way round so there would be no current flow to excite the field windings hence FA use as
far as charging the battery goes, as below.
12 V --(lamp)--|<|---[alt]
I will take a look at the book as I am all curious.
|
|
|
.jpg)
