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Jan 28, 2016 · Is it OK to allow a temporary application of 12V (from battery bank via a switch) to the D+ terminal on an alternator, usually while the engine is NOT running, but also when it IS running (in case I forget to switch it off!).
- 1/ With the engine not running, you'll be putting max current into the alternator's field coil (stator), several amps, so if you forget to turn it...
- Yes, I was thinking a diode might be required. Sounds like the best option. Can you point me to such a diode? Thanks Nick.
- Why mess about with the charging circuit when a switch in a piece of cable between the two bank pos. will do the same - that is unless you have a s...
- Which relay is it (need to know coil resistance to know the current)?
- I dunno at the mo, but I'll measure the resistance of it later, if that's any use? Thanks Tony Yes, there is a relay involved, I'm just looking for...
- I'd suggest this diode, at 6A rating it will surely be man enough, probably over-rated but only twice the price of a 1A one that might be marginal....
- The relay coil is 33 Ohms, Nick.
- I am totally confused by this thread. You talk of joining two banks and also equalising from an external source? Do you really mean the B+ terminal...
- So about 1/2 amp at equalising voltages. 1A diode would probably be enough, but hot engine bay, continuous operation, might as well go for a 3A one...
- my starter battery is now 9 years old and has been ignored and abused for all that time if it failed tomorrow it would annoy me but be no loss. i d...
Mar 7, 2024 · This requires current through the warning light bulb into the D+ terminal to get charging going. Then there is a 6 diode machine, this does not require a warning lamp to be connected in order for it to work. It is not uncommon for the smaller engine alternator to be the latter type.
Aug 23, 2010 · There are 3 terminals on the alternator labelled REG, POS and NEG. ( I gather these are equivalent to D+, B+ and B-) The alternator has an internal regulator, which has one wire connected to the REG terminal. The other is "floating". I assume it was removed from one (NEG?)of the terminals when the alternator was disconnected.
- A photo would probably help.
- There will be people who can offer more complete advice than me on this but I'm not really clear as to the actual situation. It sounds as if you ha...
- Or a model number. Tony
- I am wondering if the thicker wire back to the starter switch is to do with the heater plug supply as there should be no reason to take an earth fr...
- OK, Here is a basic wiring diagram: A view of the connection end of the alternator can be seen in this picture. although the regulator fitted to mi...
- I think Gibbo wanted a picture of YOUR alternator so we can see the size and colours of those lose wires etc.
- Looking at it simplisticly, there needs to be a connection from B+, P ositive, to the batteries somehow. Is the spare lead though it is black long...
- Not in a position to get a photo of my alternator - my camera is abroad with my daughter at the moment! However diagram indicates actual colours of...
- It looks to me like... The flying lead from the alternator connects to the thin red Warning Light wire. Perhaps the previous owner connected them t...
- Tony is spot on with his wiring. As for the alternator output going through the ignition switch and ammeter.... That will achieve a few things........
Jan 5, 2008 · Although I can give you generic connections now (eg: the terminal marked B+ is the output, the terminal marked D+ goes to the charge light, the terminal marked W is the tacho connection) this presupposes your alternator uses the conventional markings.
Mar 30, 2021 · Looking at the wiring diagram it looks like the yellow/black wire goes to the D+ terminal, which I assume is the one nearest the top of the photo. I did have the battery alarm sounding when I ran the engine after a few seconds, connecting the yellow/black wire to the top terminal seems to have stopped that.
Jun 7, 2020 · The Lucas test card for 9 diode alternators says that to test at the D+ terminal you disconnect it and measure the voltage at end of the D+ cable with the ignition switch on - expect battery voltage. A quick and dirty test is to earth the D+ wire/terminal at the alternator end with the switch on and see if the waning lamp bulb lights.
Mar 13, 2021 · The cable to the ignition warning light, which is the thin one, will go to D+ The cable to the tachometer, if fitted, will go to W, but it doesn't look like you have one of those. In addition, you will need to add a new cable of the same size as the B+, but black.
