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06-26-2011, 09:11 AM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,409
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Not Ranked
From our phone conversation, it appeared you had check or replaced everything in the charging system. Verified wiring connections, grounds, battery condition, alternator output voltage, etc. You also stated that you are not having any starting problems...But the charging light persisted...
I may not as familar with your manufacturers wiring design, but they all work similar. Sometimes waiting for something to outright fail is the easiest thing to do...at worst you'll need a jump to get the car home...and the problem will then be evident. Did you have the battery load tested off the car? The black tape comment I made was an attempt at humor...(you could also remove the bulb from the indicator light for a cleaner look on the dashboard)
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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06-26-2011, 09:29 AM
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CC Member
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Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
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Not Ranked
Take to a generator tester place and have it loaded to test
psycolSEAL I don't trust Autozone or pepboys for testing but both have tester for Alt. It sound like one of the bridges or diodes is going bad. If everything is checking out, what is the voltage at the battery at idle and 1,500 rpms. We want to see about 13.8-14-2 voltage. without any loads. Then repete the same thing with headlights, fans, fuel pump, blower motor all on high speed. Tell us the voltage readings again at idle and 1,500 rpms. Test for 10-15 seconds. Do this with the motor cold and at operating temps after 10-15 minutes of the car running with hood closed. Tell us what the tests come out to. Do you know a Jim Watson?? believe he's a master chief?? Try the test. Rick L.
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07-02-2011, 10:21 PM
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CC Member
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Join Date: Jul 2005
Location: Milton,
WV
Cobra Make, Engine: 351 Windsor
Posts: 179
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Not Ranked
Blas, I know you were joking. I shared the tape remedy with a few friends, they got a good laugh out of it. I appreciate your help!
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07-02-2011, 10:24 PM
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CC Member
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Join Date: Jul 2005
Location: Milton,
WV
Cobra Make, Engine: 351 Windsor
Posts: 179
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Not Ranked
Rick and WBulk, I will check again on Sunday. I appreciate your input. Things like this drive me up the wall!
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07-03-2011, 11:54 AM
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CC Member
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Join Date: Jul 2005
Location: Milton,
WV
Cobra Make, Engine: 351 Windsor
Posts: 179
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Not Ranked
Battery engine off 12.5
At 1200 - 1500 rpm 14.3
Engine warmed up with fan on 13.9
Ran another ground wire to a different location on block. Light did not come on until running for about 1 mile. Light came on and then off after a few seconds. Drove approx 3 miles with no alternator light on. Checked voltage at altternator when running. Same reading 13.9 with fan on. ???????????
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07-03-2011, 01:21 PM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 3,028
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Not Ranked
Quote:
Originally Posted by psychoSEAL
Battery engine off 12.5
At 1200 - 1500 rpm 14.3
Engine warmed up with fan on 13.9
Ran another ground wire to a different location on block. Light did not come on until running for about 1 mile. Light came on and then off after a few seconds. Drove approx 3 miles with no alternator light on. Checked voltage at altternator when running. Same reading 13.9 with fan on. ???????????
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13.9V at what RPM? Which fan? (or better yet, how many Amps does it draw?) 13.9V at above 1500 RPM with the fan on is marginal, so I would suspect a bad diode in the alternator. Less likely: bad battery. |
07-03-2011, 02:08 PM
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CC Member
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Join Date: Jul 2005
Location: Milton,
WV
Cobra Make, Engine: 351 Windsor
Posts: 179
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Not Ranked
13.9 at 1200 - 1500 rpm Taurus 3.8L Low speed fan
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