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TurboRA28 Forums Junkie Location: Terrigal Registered: May 2002	Electronic gurus Tue, 05 October 2004 11:45 Hi all, need some help from the electronics gurus out there. I'm working out a way to improve the function of a craig davies electric water pump. At the moment its wired up to ign + so takes ages awhile for the engine to warm up and creating un-necessary wear on the pump. There is a controller box for it based on water temp, but the big problem with this is the pump doesn't spin until the water is at a certain temp and the temp sensor isn't inside the engine so the temp sensor never sees an accurate water temp because the water isn't flowing. So... my idea is to create a simple circuit that works something like that : ign + switches on a relay that powers the pump with a resistor inline so the pump only runs very slowly, say maybe supply it with +4v or so. Then i'll have a temp sensor switch, like the thermo fan switch on/off switch (90 degree on, 85 off, or so). This will switch on another relay and supply the pump with +12v. So does that sound ok ? What size resistor would I need to cut 12v down to 4v or so. Can I get a variable resistor so I can select how many volts the pump gets so I can get it just spinning enough to flow water past the temp sensor? When the relay connected to temp sensor switches on and supplys the 12v to the pump, what effect will that have on the other circuit with the resistor etc? Should I put a diode after the resitor, but before the pump, and have the 12v switch after the diode so the power cant flow back to the resitor and other relay? I hope that makes some sense.. Thanks Joel [Report message to a moderator]

	Subject	Poster	Date
	Electronic gurus	TurboRA28	Tue, 05 October 2004 11:45
	Re: Electronic gurus	shinybluesteel	Tue, 05 October 2004 11:55
	Re: Electronic gurus	sideshow	Tue, 05 October 2004 12:00
	Re: Electronic gurus	river	Tue, 05 October 2004 12:19
	Re: Electronic gurus	Cool1	Tue, 05 October 2004 12:27
	Re: Electronic gurus	THE WITZL	Tue, 05 October 2004 12:35
	Re: Electronic gurus	mrshin	Tue, 05 October 2004 14:05
	Re: Electronic gurus	TurboRA28	Tue, 05 October 2004 23:43
	Re: Electronic gurus	sideshow	Wed, 06 October 2004 05:38
	Re: Electronic gurus	TurboRA28	Tue, 05 October 2004 23:50
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 00:17
	Re: Electronic gurus	brett_celicacoupe	Wed, 06 October 2004 01:05
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 02:04
	Re: Electronic gurus	wagonist	Wed, 06 October 2004 02:21
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 02:27
	Re: Electronic gurus	wagonist	Wed, 06 October 2004 02:40
	Re: Electronic gurus	CrUZsida	Wed, 06 October 2004 03:04
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 02:50
	Re: Electronic gurus	wagonist	Wed, 06 October 2004 03:00
	Re: Electronic gurus	M.W.P.	Wed, 06 October 2004 03:13
	Re: Electronic gurus	brett_celicacoupe	Wed, 06 October 2004 04:07
	Re: Electronic gurus	river	Wed, 06 October 2004 05:38
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 06:02
	Re: Electronic gurus	sideshow	Wed, 06 October 2004 06:13
	Re: Electronic gurus	TurboRA28	Wed, 06 October 2004 06:38
	Re: Electronic gurus	sideshow	Wed, 06 October 2004 07:22

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