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Old 12-21-2014, 12:29 PM
97 SL320 97 SL320 is offline
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A few other design considerations.

Some relays have a diode across the coil to limit the inductive spike when the relay is shut off. There are a lot of diagrams that interchange power / ground on 85 - 86 and I don't recall what is correct.

Put the relay under hood so high current wiring is minimized.

The fuse goes as close to the power source as possible as wiring up stream of the fuse isn't protected. ( Unless it eventually leads to a distribution fuse.)

You will need some sort of indicator to show the lights are on.

Power feeding your switch should be hot only when the ignition is on, this prevents the lights from being on while the car is off.
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