Electrical relays

["Benfield, John" <john.benfield@xxxxxxx>]

Need a bit of help with souring an electrical replay.

I have a small diesel generator that I wish to control remotely. I have
probed the existing key barrel and have determined which wires need to be
connected to a) pre-heat the plugs and then b) start the generator. If I
connect the wires locally, the genny fires no problem. When I attach the
length of control wire that I need (50m), the pre-heat works but the start
doesn't. Even attaching a small length of wire (5m) to the start pins it
doesn't start.

I guessed that I might need a relay located in the generator so that the
length of wire in the start circuit is small. Did a bit of Heath Robinson
at
the weekend and got a generic 30A car relay. However this doesn't seem to
want to work either. I've actually got an battery inverter doing the
controlling of the two circuits, but I guess that the small amount of power
it is putting down the cable is not enough to trigger the relay (again, the
pre-heat works fine with no relay).

I had a look at the RS web site, but it listed five pages of relays, and
not
being and electrical type got very confused. Has anyone got any ideas of
the
type of relay I need?

JB




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