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09-24-2003, 08:45 PM
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CC Member
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Join Date: Jul 2002
Location: Greenville,sc,
SC
Cobra Make, Engine: Kirkham 427 (KMP 266); CAV GT40
Posts: 1,464
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Not Ranked
oil pressure gauge question
Finally got my water temp gauge problem worked out(bad sender),now it appears my oil pressure gauge is malfuntioning.It has read 50-60 lbs from the beginning and today it will not budge from 25 lbs,with switch on or off.Any thoughts?AlsoI got rid of my ammeter and bought a voltmeter(SW).On the back one post is labled with a +, the other post labled with a I. I thought one should be negative- and the other positive +.In my mind the I would stand for ignition and assumed to be the positive hot wire.What gives? chuck |
09-24-2003, 09:39 PM
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CC Member
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Join Date: Jan 2003
Location: Atlanta,
GA
Cobra Make, Engine: CAV GT40 with 331 KC
Posts: 2,187
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Not Ranked
Doc I think that you may be looking at it on it's side? It should be + and -...
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09-24-2003, 09:55 PM
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Senior Club Cobra Member
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Join Date: Jun 2001
Location: North Metro Atlanta,
GA
Cobra Make, Engine: 2 dr roadster, V-8, 4 spd.
Posts: 2,780
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Not Ranked
Chuck,
I agree with Pat, take the + wire and hook to +. Take the other and hook it to - or l. Then watch it work, or get ready to arc weld  Just kidding. Do a quick turn of the key or whatever you use to trigger voltmeter, worst case should spike in reverse and then correct wires. I have traced essentially all the wires on mine if you want to call me for the colors of my voltmeter wires, feel free. Excelguru knows how to get me live in case you don't. |
09-25-2003, 06:10 AM
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CC Member
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Join Date: Apr 2003
Location: Sparrowbush,
NY
Cobra Make, Engine: A&C 351W, C4
Posts: 407
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Not Ranked
SW Voltmeter
The SW voltmeter needs a separate ground wire for the gauge light to work. The negative terminal on the back of the gauge is insulated from the gauge housing so the gauge light is not automatically grounded like the other SW gauges. Just run a separate graund wire to the housing.
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09-25-2003, 08:05 PM
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CC Member
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Join Date: Jul 2002
Location: Greenville,sc,
SC
Cobra Make, Engine: Kirkham 427 (KMP 266); CAV GT40
Posts: 1,464
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Not Ranked
Thanks guys,of course you are correct.I just cannot figure out why all my other SW gauges have pos and neg and I for ignition on the back and this gauge has different nomenclature.British electronics are screwy. chuck
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09-25-2003, 08:10 PM
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Senior Club Cobra Member
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Join Date: Jun 2001
Location: North Metro Atlanta,
GA
Cobra Make, Engine: 2 dr roadster, V-8, 4 spd.
Posts: 2,780
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Not Ranked
Chuck, if it makes you feel better...Smiths have no markings whatsoever. I was playing with my voltmeter today, cogniscent of your post and looked for markings. They must have been "optional"  They do have a diagram showing the dashlight socket in the middle and make a point of showing +12 and ground right and left. Do a quick battery hook up to validate what you see. |
09-25-2003, 09:07 PM
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CC Member
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Join Date: Nov 2002
Location: Flanders,
NJ
Cobra Make, Engine: Classic Roadsters 351 Windsor 405 HP
Posts: 1,043
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Not Ranked
Made in Mexico thanks NAFTA
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