Need help with fan wiring
Thread Starter
On The Tree
Joined: Jun 2008
Posts: 164
Likes: 0
From: Hallandale Beach, FL
Need help with fan wiring Having problems getting fans to work after 24x conversion.. I have a painless harness...and I want to run a 2 relay set up.
So the wires for fan 1 and 2 from the PCM put out a ground signal and I'm getting that signal when the temp reaches..now that should switch my relay but it doesn't...for some reason I cannot use that wire as a ground I even tried using it for another accessory and it won't work as a ground...I don't understand it's groundin out but won't ground the relay to turn fans on...extremely frustrating...
So the wires for fan 1 and 2 from the PCM put out a ground signal and I'm getting that signal when the temp reaches..now that should switch my relay but it doesn't...for some reason I cannot use that wire as a ground I even tried using it for another accessory and it won't work as a ground...I don't understand it's groundin out but won't ground the relay to turn fans on...extremely frustrating...
Thread Starter
On The Tree
Joined: Jun 2008
Posts: 164
Likes: 0
From: Hallandale Beach, FL
What is happening is the wires from the PCM are receiving its signal and are grounded by the PCM...when I put the PCM wires to the relay...nothing it doesn't ground the relay...it's like it's not a good ground and I'm very confused
Thread Starter
On The Tree
Joined: Jun 2008
Posts: 164
Likes: 0
From: Hallandale Beach, FL
Does the coolant temp sensor on the water pump have any part in the grounding process? Also I have a mechanical water gauge but the PCM doesn't get any info from that correct?
TECH Veteran
Joined: Dec 2008
Posts: 4,145
Likes: 61
From: Little Rock, AR
I would not think the coolant sensor has a part in it. The normal LT1 PCM does not receive anything from the gauge sensor. But you are using an LS1 PCM because of the 24x swap, correct? The connectors and ground locations are different.
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Thread Starter
On The Tree
Joined: Jun 2008
Posts: 164
Likes: 0
From: Hallandale Beach, FL
Yea I am using an ls1 PCM It has pretty much the same set up...and it sends the same signal which is a ground, an what's driving crazy is it is sending the ground...I told the tuner and he sai he'll check it out so ill get back to this thread after the Dyno
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