> Relay? Did I miss something?
He said he was installing a Dan Masters wiring kit, which includes a block full
of relays and fuses; one relay is for the pump. You may recall he talked about
the wires from the block ...
> Most people don't bother with relays for the
> small pumps since they only draw a few amps.
"Most people" not including Dan Masters, I guess. Compared to the constant
under-engineering our cars had originally, it's kind of refreshing to work with
an over-engineered kit !
> But if you are using a
> relay then
> indeed a diode will solve that sneak circuit.
A diode will also work for the pump, just takes a bigger diode. Still cheap.
> But then you should put in an
> MOV across the relay coil (or the diode) to prevent the inductive kick back
> from over stressing the diode.
A MOV (metal oxide varistor) seems both unreliable and overkill, IMO. Easier,
cheaper, better, IMO, to just use an oversize diode that can take the stress.
For the relay, a 1 amp, 50 volt diode should be plenty. For the pump, you could
go really overboard with 25 amps, 200 volts, and still pay only a dollar or two
for the diode. If you really want to be cheap, rob a diode from an old
alternator <G>
Randall
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