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Old 08-15-2007, 01:50 PM
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Relay voltage feedback

A few days ago I mentioned a relay for an auxiliary fuse panel and I finally ended up with a NTE 70 amp automotive relay (Fully loaded the fuse panel will total 45 amps but it will probably never see a full load). What I am concerned about is that while testing this thing prior to the permanent hook-up I was touching the control wire to the terminal to make sure the relay was working and I would get a mild shock when I removed the wire, I know what causes this and it was not entirely unexpected but I was a bit surprised at how strong it was. Could this voltage spike damage the computer? Could I use a diode similar to the set-up on an AC clutch to prevent this from feeding back into the wiring? How do the factory relays deal with this?

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Old 08-15-2007, 03:26 PM
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What's being controlled by that relay? What kind of a car is it?
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Old 08-15-2007, 04:58 PM
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Doc here,

Place a .1 MFD , 500 WVDC, Disc, Cap from each RELAY COIL terminal to a good ground.

This will allow the AC field to collapse to ground and IGNORE the DC..

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