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Old 03-24-2011, 11:47 AM
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fuse for relay power?

i am rewiring my '65 chevy C-10, do i need to install fuses for each of the 5 relays? ( headlights, fuel pump, radiator fan, ignition, horn )
Not the devices, that's common sense,but the power to the relay from the battery
Thank you for the help

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Old 03-24-2011, 11:58 AM
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All wiring must be protected by a fuse. The load determines the wire size. The fuse is sized to protect the wire and the load.
The load of a relay coil is very small so #18 wire could be used but the fuse needs to be 10 amp. This 10 amp circuit can be used for all the relays.
Or, the relay coil circuit can be powered by an existing circuit having the proper fuse size. Interior lighting for example.

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Old 03-24-2011, 12:00 PM
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You can install a fusable link that feeds the power to be on the safe side.
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Old 03-27-2011, 07:08 PM
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Fuse Block

Consider this; an auxiliary fuse panel, like shown in the attached link. I prefer fuses, as opposed to a fusable link, because you'll never be stranded when using fuses, as they are readily available; not necessarily so with fusable links. Attachment:


NAPA is a good source for the fuse block shown; smaller sizes are also available.
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Old 03-28-2011, 08:34 AM
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All relay power should be fused. As mentioned the coil of a relay is very low current, usually around 250ma. A 10 amp fuse as mentioned should power all the realys you have with capacity to spare.

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