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Discussion Starter #1
Im wondering if you need to run diodes across the coil with relays in automotive stuff? Simple enough to do just wasn't sure if its neccesary of beneficial.

Set up something with a couple of relays once and an auto elec said it was backfeeding, and im about to do some more work so good time to learn the right way

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No. If you are using a switch to activate the relay, there is nothing to hurt and most all electronic devices that control things via relays have components that have the diodes built in. It is to protect the driver from the inductive kickback of the relay's coil.
 

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It's not a bad idea. You can buy 5 blade relays with a built-in diode.
 

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Discussion Starter #4
Built in would be the neatest, I figured my original problem was using a 'hot' power instead of switched ignition source so i'll make sure thats right this time, thats what the auto elec changed, just switched the feed for the whole setup off the battery + to ignition
 

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you can look at the diagram on the side of the relay and see if there is a diode. Most Bosch and Tyco have them
 
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