Hello

I have a dynamo from a Renault 9 and I want it connected to a small benzene engine. Does anybody know how to connect the accu at the dynamo? In a way that I can take power of it as it is recharging?


John

He John,

It's easy. Your alternator (dynamo) has four poles for connections. B+ en B- are the poles you need for recharging a battery (accu). The other two, on the "regalateur" box, well I guess they are for reducing electromagnetic noise. You can always check the poles with a volt meter.

John, formerly driving a 11 GTX Cheverny

Gewoon ff proberen met een voltmeter dus. Weet ook niet of het uitmaakt welke kant de rotatierichting op is.

I think the two other poles are for the battery warning light on the dashboard.
The thick wires on the alternator are the charge wires. All the charge-electronics is integrated in the black box (regulateur) where the coal brushes are.

Good luck, Maarten Boersma

I've just been browsing through the forum, and seen this message for the first time. If you've already sorted the problem out, then ignore this.
As the responses said, the B+ and B- are for connection to the battery. The other two are for exciting the rotor. An alternator is not like the old generators, which had permanent magnets for the field. An alternator does not have permanent magnets, and therefore will not produce any current until the rotor, which is basically an electromagnet, is excited by feeding it with current. Once the rotor is excited, it induces current in the field coils. Once this starts to happen, the alternator self-excites, and no more external current is needed for the rotor. The excitation current is routed through the warning light, which therefore lights up when the alternator is not producing any current, and which goes out when the alternator is producing current.

Vic in Portugal.