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Tech & Fab
Manually controlling electrical fans
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<blockquote data-quote="RustyC" data-source="post: 620787" data-attributes="member: 1997"><p>A double pole double throw would work if I'm thinking correctly. Rocker style switch have 3 positions, up, middle and down. </p><p>Up position will be FAN ON and will connect the ground of the fan relay coil to ground. Turning on the relay / fan.</p><p>Middle position will connect the ground for the relay to the ECM as normal allowing the ECM CONTROL of the fan as needed.</p><p>Down position would leave the ground for the relay open. Keeping the FAN OFF</p><p></p><p>This is with the relay having battery power supplied to relay terminal 30 and 85.</p><p>Pin 87 to the fan.</p><p>Pin 86 to the above switch. </p><p></p><p>I would use a big ass blinking light on the fan off side. Having an off position for a fan is asking for an overheated engine. I have personal expiriant with this, trust me.</p></blockquote><p></p>
[QUOTE="RustyC, post: 620787, member: 1997"] A double pole double throw would work if I'm thinking correctly. Rocker style switch have 3 positions, up, middle and down. Up position will be FAN ON and will connect the ground of the fan relay coil to ground. Turning on the relay / fan. Middle position will connect the ground for the relay to the ECM as normal allowing the ECM CONTROL of the fan as needed. Down position would leave the ground for the relay open. Keeping the FAN OFF This is with the relay having battery power supplied to relay terminal 30 and 85. Pin 87 to the fan. Pin 86 to the above switch. I would use a big ass blinking light on the fan off side. Having an off position for a fan is asking for an overheated engine. I have personal expiriant with this, trust me. [/QUOTE]
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