XR8 XR6 Club of Victoria
Join Date: Nov 2001
Location: Melbourne, Australia
The way it should be wired:-
The thermo switch (unit on the other end of the copper probe) should have two connectors on it.
One of these should go the chassis (aka negative or earth)
The other terminal should go to the relay terminal 85 (if a standard relay)
The terminal opposite is 86 and that should go to a +12v circuit that is only powered when the ignition is on. The +Ve to the coil is OK to use.
The relay should be at least a 30A type but a 40A would be preferred.
The switch contacts on the relay will be numbered 87 and 30.
One of these (say 30) should go to the +ve on the battery via a fuse.
The fuse should be 15A per fan so if two fans use 30A fuse. You could also use a 20A per fan fuse size but not any larger.
Use a fuse holder like a Narva 54382BL (for 3AG glass fuse) or 54406BL (for standard blade fuse).
Other relay terminal (87) would go to one wire on the fan(s) with the other fan wire(s) connecting to the chassis or to the -ve battery terminal.
Do Not's -
Do not power Fans from the ignition circuit or washer wiring (or any other existing circuits). These do not have the current handling to supply the power needed by the added Fan(s) with 10A to 15A each. You will burn out the wiring or blow fuses.
Do not connect the fans to the battery without a fuse to protect the wiring. Go to a wrecker and see how many cars are there with burned engine bays (lack of fuses and modified wiring is a common cause).
Do not connect to the alternator but always connect to the Battery via a fuse.
The fans are normally mounted inside the radiator so try the fan wiring connections so you get the fan sucking air through the radiator and blowing into the engine bay.
You can test the relay to see if the pin numbers are as described by temporary connections before wiring in all in permanently.
You can test the thermo switch by insterting the bulb into a saucepan of water on the stove, bringing it to the boil and testing that the switch clicks on, remove the bulb and stick under half hot/half cold water out of the tap and check it switches off.
The XR family ---->
Muzza: a XR8 AU seriesIII...bog standard :)
TBH: (the better half) drives an ED XR6 wagon (Mock Dev 4 160rwkw, JMM extractors, 4 electric windows, Ghia door panels in XR trim, rear head & arm rests in XR trim, Momo s/wheel with Cruise, EL thermos, EBGT wheels, etc) things to come soon = EECV upgrade.
Last edited by Muzza; 07-07-03 at 08:19 PM.