"William M. Gilroy" wrote:
>
> I have a rather stupid question about relays and I am sure someone
> on the list can help. Here goes. I have a 30 amp relay that
> has the following markings on the terminals: 30, 85, 86, 87, 87A.
> My understanding of the terminals is this:
>
> 30 = power into the relay
> 85 = power that cause the relay to switch
> 86 = ground for 85 and relay
> 87a = power when the relay is inactive
> 87 = power when the relay is active (when there is power on 85)
>
> My question is have I correcttly labeled 85 and 86? Does it matter
> if I reverse the power and ground on 85 and 86? Would that affect
> how the relay function. I would like to get this right the first
> time, that way my fuel pump will work.
>
A couple of other things. I have two relays from different makers,
but the are functionally the same according to the diagram on them.
The first is a Hella relay, part number 4RD 960 388-46 and the second
is a Hamsar, part number 42-032. The Hella has a plastic mounting
tab while the Hamsar has a metal mounting tab. I am not sure if the
metal mounting tab is connected to the ground lead, number 86, since my
ohm meter just went south. One other thing they are 40 Amp relays
not 30 Amp.
Bill Gilroy
77 Midget
90 Shar-Pei
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