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How To Wire A Relay

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#1 KernowCooper



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Posted 26 July 2013 - 10:54 AM

You normally have 4 terminals on a standard relay (There are relays with more but were dealing with the std 4 terminal type here)


This takes the load out of old switches as they are only then switching the relay current.



85 - 86 - 87 - 30


85 = The earth connection to the body to make the relay switch

86 = The switched 12v feed from either a on/off switch or a feed from a headlight main beam or similar

30 = The main feed into the relay from the starter solenoid or another 12v pick up point (Fused for anything other than Headlights) Headlights double up on the relays - 2 for l/r dip beam  2 for l/r main beam if you wish like the rallys cars.

87 = the relay switched feed out to lights or anything else, fuel pumps/amps/fans ...









The Tamping Diode will always be between terminals 85 and 86, used to prevent the relay switching back on by its self

Edited by KernowCooper, 03 August 2014 - 10:10 PM.

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