Fan relays
#1
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Fan relays
I have searched and read as many of the fan wiring threads as I can find. I am fairly new to taking on the electrical sides of vehicles and want to make sure I get this correct. I have a LQ4 in my '72 Nova with a Be Cool radiator and Be Cool dual 11" fans. I have a PCM from Speartech with wiring leads for the fans. I want to use 3 relays and have found a couple different wiring diagrams. What I haven't been able to find is specific information about the Relays. Like I said I am new to the electrical side of vehicles. Are there any specific relays I should be looking for or will any single pole relay work?
Thanks in advance
Thanks in advance
#3
Cheapest place to get fan relays is a pick and pull. If you are buying something else they will usually give you the relays for free. You can usually grab them off any POS ford in the yard with little or no effort. If you grab them off the fan of a Taurus then you know they are rated for the current.
#4
I have searched and read as many of the fan wiring threads as I can find. I am fairly new to taking on the electrical sides of vehicles and want to make sure I get this correct. I have a LQ4 in my '72 Nova with a Be Cool radiator and Be Cool dual 11" fans. I have a PCM from Speartech with wiring leads for the fans. I want to use 3 relays and have found a couple different wiring diagrams. What I haven't been able to find is specific information about the Relays. Like I said I am new to the electrical side of vehicles. Are there any specific relays I should be looking for or will any single pole relay work?
Thanks in advance
Thanks in advance
http://www.dewitts.com/download/FRH.pdf
#5
Here is the schematic that I used to build the three relay fan control that is found on this forum. It works real well and is very quiet. I do remember that there is a certain relay that you need to use to be able to switch from series to parallel; not all relays can handle that function as designed here. Below are the specs on the relays.
50 AMP Relays AWS-75311
Relay Sockets AWS-RBKTM
50 AMP Relays AWS-75311
Relay Sockets AWS-RBKTM
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#8
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http://www.texasindustrialelectric.com/relays.asp
for my Taurus fan setup, I ordered a 70 amp 5 prong relay for the high speed and a 30/40amp relay for the low speed, both with small resistors in them to help keep the relays healthy.
for my Taurus fan setup, I ordered a 70 amp 5 prong relay for the high speed and a 30/40amp relay for the low speed, both with small resistors in them to help keep the relays healthy.
#10
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Mark
#13
The type of relay is a resistor or diode protected relay so that the voltage spike doesn't damage your ECU. Regular relays will not have this protection built in! I incorrectly stated that it had to do with the change from series to parlallel. Getting old sucks!
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Here is the schematic that I used to build the three relay fan control that is found on this forum. It works real well and is very quiet. I do remember that there is a certain relay that you need to use to be able to switch from series to parallel; not all relays can handle that function as designed here. Below are the specs on the relays.
50 AMP Relays AWS-75311
Relay Sockets AWS-RBKTM
50 AMP Relays AWS-75311
Relay Sockets AWS-RBKTM
Another thing I did is to go to U-Pull-A-Part and get an integrated relay pack with a built in fuse. Mine came from a 92 toyota Corolla. It has to be re-pinned and wired but it has the correct (3) relay recepticals & a built in heavy duty fusible link (fuse) slot. It's sealed & weatherproof and once done, compact and looks factory.