Beta Diesel Alternator Connections

[AlistairC]

Hi all,
I'm trying to get an Adverc wired up, but I dont know which wires are which on my alternator (I've got someone coming to help, but I kind of need to be off and sailing by then)
I have a Beta marine engine with a 30A Alternator, the positive connection is obvious, the negative is the chassis so obvious too.
I also have two spade terminals at right angles to each other, and one wire that comes out of the alternator in a grommet which is blue.

Any ideas which wire is the field coil? and what the other two might be?

Cheers
Al

 

[bobgosling]

Can't help directly other than by suggesting that you contact Beta ( assuming that the alternator was supplied by them with the engine ). I have always found Beta staff to be extremely helpful, even when you are asking "stupid" questions.

If I find time I'll take a quick look in the engine handbook. there are loads of wiring diagrams in there which may help. I have a BD722 myself but it has a 55A alternator so may be wired quite differently.

I suspect that at least one of the unidentified feeds is for a Tachometer connection.

 

[Kurrawong_Kid]

Give Adverc a ring with the type of alternator-I'm sure they will give you an answer or even e-mail a diagram.

 

[Krusty]

I have an Adverc for a BD722 with 70A alternator.
From memory, I think I was well advised that use of an Adverc requires a higher-than-standard alternator capacity.
Unless your battery capacity is unusually small, say 60Ah in total, I think you will find a 30A alternator will be overloaded, with risk of a very short life.
If you have not yet asked either Beta Marine or Adverc, or both, you should do so before going ahead.

 

[BobL]

I think you will have a Nippon Denso alternator; I have one on my BD722. The wire with the grommet is for use with a tachometer if you have one. The other two with spade connectors are IGN ( feed from start switch) and L (warning light). The IGN one is marked on the connector housing. None are the field connection. To get to this you will have to remove the end cover from the alternator, locate it in the manner I think Adverc describe and connect a wire to it. If you go to www.wai-wetherill.com/products/ymm.cfm and then select electrical system, then nippondenso then int/fan int/reg,then regulator, you will get a list of regulators and I think yours will be IN254, where selecting it you will be able to get a view which shows all the regulator terminals including the field connection.A bit long-winded but I hope this helps.

 

[AlistairC]

Smashing, thanks very much for that, I am now much better educated. Its a bugger about the lack of field coil.
Beta quoted me £250 for a 70A one and Poly-Vee pullys,
maybe I should just get them to send me that kit with the field coil connection

 

[davidbains]

On a Yanmar 20.
I bought a 70amp alternator from Adverc which was simple to connect to their regulator.
It still took some time to get phone and email advice from Adverc about which wire to discard.
However I was disappointed when the alternator lug containing the tension adjusting bolt shattered!! Although I temporarily got round the problem by fitting another bolt underneath it.
I am now considering moving to a Balmar marine grade alternator from Merlin, although they cannot be connected to Adverc regulators. And in fact may not need an extra regulator.