Fan Relay
Thread Starter
ROTM Moderator
Joined: May 2007
Posts: 8,158
From: AL
Fan Relay
Ok so my Mark 8 fan showed up today and I've been reading that my relay isn't good enough. I currently have a 30 amp relay, which has actually quit working. Any recommendations on what size relay setup I need to run? I don't want to spend a lot on the kit(< $100) since I've drained what little savings I had on other things.
Also, holy crap this fan is huge!
Also, holy crap this fan is huge!
Last edited by 1slow67; Oct 18, 2011 at 09:44 PM.
2nd Gear Member
Joined: May 2011
Posts: 183
From: NY
Ok so my Mark 8 fan showed up today and I've been reading that my relay isn't good enough. I currently have a 30 amp relay, which has actually quit working. Any recommendations on what size relay setup I need to run? I don't want to spend a lot on the kit(< $100) since I've drained what little savings I had on other things.
Also, holy crap this fan is huge!
Also, holy crap this fan is huge!
this is the kit I use which turns on at 185
Mr Gasket thermostatic sensor part 1992 at advanced auto parts
http://shop.advanceautoparts.com/web...___#fragment-4
2nd Gear Member
Joined: Jun 2011
Posts: 486
From: Texas
I recently installed one using a common 70 amp SPDT relay. It's a Delco kit that comes with the pigtail and socket for about $50. Not cheap, but high quality. Usually in stock at Carquest. Just ask for it.
It allows you to operate a 70 amp fan load from a generic temp sensor. The sensor I used comes from late '80s Mopars. It has a 3/4 npt thread and two male spade terminals for you to plug onto. It cuts on/off around 178*.
Wire the fan through the relay with a good sized fusible link at the battery. Wire the relay through an ignition hot fused inside the car. This way the fan could short and it will be disconnected when the fusible link fails and no wiring inside the car is at risk. If the relay shorts, it will pop the fuse on the ignition hot circuit.
Use a second one for A/C activation of the fan and you get the bonus of having a redundant relay that can be swapped in if the primary should fail.
It allows you to operate a 70 amp fan load from a generic temp sensor. The sensor I used comes from late '80s Mopars. It has a 3/4 npt thread and two male spade terminals for you to plug onto. It cuts on/off around 178*.
Wire the fan through the relay with a good sized fusible link at the battery. Wire the relay through an ignition hot fused inside the car. This way the fan could short and it will be disconnected when the fusible link fails and no wiring inside the car is at risk. If the relay shorts, it will pop the fuse on the ignition hot circuit.
Use a second one for A/C activation of the fan and you get the bonus of having a redundant relay that can be swapped in if the primary should fail.
Last edited by scottybaccus; Oct 18, 2011 at 11:08 PM.
4th Gear Member
Joined: Feb 2006
Posts: 1,538
From: So. Cal,the O.C.
We (PAC) have a 80 amp relay(p/n pac80).I didnt use one because I didnt work for the company at the time, so paid about 45 bucks for a 70 amp relay.No controller,no sensors, just a switch to a relay.Has worked great for about 7 years now.
http://www.onlinecarstereo.com/CarAu...ice_Comparison
http://www.onlinecarstereo.com/CarAu...ice_Comparison
Thread Starter
ROTM Moderator
Joined: May 2007
Posts: 8,158
From: AL
I recently installed one using a common 70 amp SPDT relay. It's a Delco kit that comes with the pigtail and socket for about $50. Not cheap, but high quality. Usually in stock at Carquest. Just ask for it.
It allows you to operate a 70 amp fan load from a generic temp sensor. The sensor I used comes from late '80s Mopars. It has a 3/4 npt thread and two male spade terminals for you to plug onto. It cuts on/off around 178*.
Wire the fan through the relay with a good sized fusible link at the battery. Wire the relay through an ignition hot fused inside the car. This way the fan could short and it will be disconnected when the fusible link fails and no wiring inside the car is at risk. If the relay shorts, it will pop the fuse on the ignition hot circuit.
Use a second one for A/C activation of the fan and you get the bonus of having a redundant relay that can be swapped in if the primary should fail.
It allows you to operate a 70 amp fan load from a generic temp sensor. The sensor I used comes from late '80s Mopars. It has a 3/4 npt thread and two male spade terminals for you to plug onto. It cuts on/off around 178*.
Wire the fan through the relay with a good sized fusible link at the battery. Wire the relay through an ignition hot fused inside the car. This way the fan could short and it will be disconnected when the fusible link fails and no wiring inside the car is at risk. If the relay shorts, it will pop the fuse on the ignition hot circuit.
Use a second one for A/C activation of the fan and you get the bonus of having a redundant relay that can be swapped in if the primary should fail.
Thread Starter
ROTM Moderator
Joined: May 2007
Posts: 8,158
From: AL
We (PAC) have a 80 amp relay(p/n pac80).I didnt use one because I didnt work for the company at the time, so paid about 45 bucks for a 70 amp relay.No controller,no sensors, just a switch to a relay.Has worked great for about 7 years now.
http://www.onlinecarstereo.com/CarAu...ice_Comparison
http://www.onlinecarstereo.com/CarAu...ice_Comparison
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