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Old 12-06-2008, 10:06 AM
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Fusible Links or Relays??

I'm finishing up the wiring in my 84 Cutlass. Still need to wire the power seat, power trunk release, led driving lights, led 3rd brake light and electric fan. Which do I need relays for & which needs a fusible link? I kind of understand now how a relay works, but still a little confused on fusible links. Thanx in advance.

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Old 12-06-2008, 11:34 AM
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Rule of thumb is anything that takes lots of amps....use a relay. Things like electric fans, electric fuel pumps use relays. The other things you mentioned you can get away with fusible links.
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Old 12-06-2008, 12:08 PM
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Fusible links

Relays
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Old 12-06-2008, 12:12 PM
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They provide two different functions. Relays are a way of controlling a high current circuit without having to run all the current through a switch on your dash. A fuseable link is a circuit protection device like a fuse. Even with a relay, you still need circuit protection ie a fuse or circuit breaker.

Fuseable links are fine until they "blow" then they are a pain to replace. Fuses and or circuit breakers are a better way to protect a circuit. Self-resetting circuit breakers are a nice alternative when you have the space.
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Old 12-06-2008, 02:04 PM
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As aosborn said, relays and fusible links are for two separate functions:

Main power feed from battery or distribution point, high amperage draw (like 60-100 amps) - use a fusible link

Provide power to an individual accessory, low to moderate amp draw (up to about 30-40 amps), need to switch or control with a low amperage switch or sensor - use a relay
For example:
-- Use a main power feed from the battery (e.g. 8 gauge wire with 12 gauge fusible link) to a junction block.
--From junction block terminals use smaller gauge wires (10-16 gauge, depending on amp requirement) and appropriate size fuses to connect to each relay.
-- Use low amp draw switches (1-2 amp) to control each relay and activate the device.

Bruce
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Old 12-06-2008, 08:08 PM
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Power Seat = You need to use a self resetting circuit breaker (SRCB)
Power trunk release = 10 amp fuse should suffice
Diving lights and 3rd brake light = If tied into existing vehicle wiring, will already have circuit protection in place. There is a SRCB integrated into your headlamp switch, and the feed to your brake lamp switch is fused.
Electric Fan = Needs to be wired with a relay.

GL,
Tech
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Old 12-06-2008, 08:13 PM
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i agree with aosborn, circuit breakers all the way. circuit breakers are fuses that fix themselves automatically, fusable links are a pain in the (|)...
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Old 12-07-2008, 12:08 AM
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Quote:
Originally Posted by techron
i agree with aosborn, circuit breakers all the way. circuit breakers are fuses that fix themselves automatically, fusable links are a pain in the (|)...
You have to find and fix the problem before you reset a circuit breaker or repair a fusible link.
Having a circuit breaker does not simply anything.

From MadElectrical,

"Chevy began installing Fusible Link wires in the main-power circuits with ’66 models, and of those old cars that are still in use, most of the original Fusible Link wires are still in place. If a Fusible Link burned out then it saved the car!"
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