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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 4AGE thermo fan switch wiring
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Sat, 13 November 2004 10:16
 
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oh forgot to mention...
i have same issue as you for thermo switch, but i also want a manual override switch in the cabin to turn thermo on..
i have a normally wired (ie normally closed) relay that has.
power from battery to fuse to in on power side of relay (30).
other power side (87) goes to thermo, which then has earth straight to battery.
for switching, i have relay coil power (85) coming from 'main/EFI' relay, then the earth side of the relay coil (86) is what turns it on and off..
in cabin, i have a switch that manually grounds the relay coil..
for the temp switch, which is NC, then open when hot, i was going to get a mini relay (since it only drives the other relay) that is SPDT...
power from 'main' relay (so it's only on with ign) goes to the relay coil in (85).
the coil is then grounded by the temp switch when cold, and this opens the normally closed/SPDT contact... (with the SPDT, you can easily switch around anyway...)
the grounding side of the 'thermofan relay' goes to the power in (30), and the switched side goes to earth.
so.. when the second relay is not energised (at high temp) it's contacts close and provide a grounding path for the first relay, causing fan to go on.
when temp decreases, and the temp switch closes, the second relay energises and opens the first relays grounding circuit...
i was thinking of using a SY-4066, but pretty much anything would work.. a solid state one you could tape up would be nice..
Cya, Stewart
ps something like this
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