The later cars with the Anti-run on valve used the 3 wire sender. Looking at the wiring diagram on http://www.triumphspitfire.com/wiring.html for my car shows that one of the contacts goes to ground. So that would suggest the casing is itself not grounded.
So like Richard says get out the multimeter. So you'll need to know which pins are the ground and the one to the lamp. Should be a short between two of the pins with the ignition on and engine not running and that should switch to a short between one of those pins and the other pin with a good engine speed. So the common pin would be ground (you'll need to add a wire to the chassis) and the first non common would go to the wire to the lamp. Alan p.s. I hope this does not cause multiple messages.... -----Original Message----- From: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> on behalf of "Piter Bsna" <[EMAIL PROTECTED]> Sent: Wed, 31 Jul 2002 14:54:00 +0200 To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> Cc: "Richard Gosling" <[EMAIL PROTECTED]> Subject: RE: oil pressure sender good idea! I will make measurements and come back with the results -----Original Message----- From: Richard Gosling [mailto:[EMAIL PROTECTED]] Sent: Wednesday, July 31, 2002 12:50 PM To: Piter Bsna; [EMAIL PROTECTED] Subject: RE: oil pressure sender I haven't gone to look, but I'm reasonably sure my 1500 has a one-prong sender. The design is pretty simple, when pressure drops below a certain value the device links the prong to earth, so completing the circuit and causing the light to come on. Could it be that the sender you have is an after-market sender designed to connect to a gauge, instead of the single warning light that is standard on all Spitfires? It's possible even that the sender you have is designed to supply both a gauge AND a warning light - one prong is, as you say, earth, and should be earthed to something, one is for the gauge and provides a variable resistance, and one is for the warning light and is either on or off. If you have a multi-meter, I'd suggest checking the resistance between all of the prongs with the engine off, ticking-over, and running faster (say 2,000rpm or so), and see what results you get. Richard & Daffy /// [EMAIL PROTECTED] mailing list /// Send admin requests to [EMAIL PROTECTED] /// or try http://www.team.net/cgi-bin/majorcool /// Archives at http://www.team.net/archive /// Send list postings to [EMAIL PROTECTED] /// Edit your replies! If they include this trailer, they will NOT be sent.
