remote turn on relay

[QuickXR 10+ year member]

I have read where it is advised to install a diode across the coil of the relay (term #85&86). Does the type of diode matter? Size, etc? I'm not an electronics guru so i'm not sure if all diodes are created equal.

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[audioarsonal 10+ year member]

No diode needed.

 

[sexiewasd 10+ year member]

The diode is to suppress the voltage spike caused by the collapse of the magnetic field in the coil when the relay is switched off, Unless you have a microcontroller or some other IC driving your relay than there is no point in using a diode the cars electrical system will absorb it like it's nothing. Even if your relay is powered by the HU you will be fine without one, as internally the remote turn on wire is just connected to the HU's power supply.

 

[SPL Blazer 10+ year member]

I never heard of using one, I've had a relay in my ride for a few years and never used one.