Aternator wireing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SWINGSAX68 · 07-05-2002, 08:35 PM

OK, When my engine isn't on my lights are low and turn signals sometimes don't work. When the engine is running, everything works fine, infact better. I figured it could be the alternator, I used a light tester on the red wire that connects to the back of the alt. and it lit so I know that isn't the problem. I tried to test the blue and white wires that connect to the terminals on the side of the alt., and they do not light up the tester, is this normal? I tried it while the engine was running and the same as above. My girfreinds dad told me that with all the wires connected correctly, I could remove the Positive (+) battery cable and the truck should continue running, if it didn't then something was wrong with the alternator. Well, I did this and the engine kept on pumping as it had been, no shutting off, or change in performance. Help me out guys, it seems like the battery isn't being charged, but the red wire does that right? So according to my testing it should be charging....I dunno help me out guys!!!!

**68 Stepside** · 07-05-2002, 08:38 PM

Actually,

Your best bet would be to find a multimeter, preferably a digital one. Then start the truck, and do a voltage test across the battery. You should have ideally 13.8 volts going to the battery when the alternator is charging.

TJ

07-05-2002, 08:35 PM	#1
SWINGSAX68 Now the others dig........ Join Date: May 2002 Location: San Antonio, TX Posts: 1,520	Aternator wireing OK, When my engine isn't on my lights are low and turn signals sometimes don't work. When the engine is running, everything works fine, infact better. I figured it could be the alternator, I used a light tester on the red wire that connects to the back of the alt. and it lit so I know that isn't the problem. I tried to test the blue and white wires that connect to the terminals on the side of the alt., and they do not light up the tester, is this normal? I tried it while the engine was running and the same as above. My girfreinds dad told me that with all the wires connected correctly, I could remove the Positive (+) battery cable and the truck should continue running, if it didn't then something was wrong with the alternator. Well, I did this and the engine kept on pumping as it had been, no shutting off, or change in performance. Help me out guys, it seems like the battery isn't being charged, but the red wire does that right? So according to my testing it should be charging....I dunno help me out guys!!!! __________________ 68 Chevy C10 Stepside Black Primer 78 GMC Longbed White 09 Chevy Silverado Shortbed Granite Blue *LOOKING FOR A 67 4 DOOR IMPALA!!!Just like Sam and Dean Winchester!! 'Cause Mustangs are for p^#$ and you can fit a body in the trunk of a 67 Impala* MEMBER OF THE DRUM BRAKE CLUB Bachelor of Music in Jazz Studies Texas State University-San Marcos, TX Certified Music Educator I hope Mom is up there watching and being my Guardian Angel "I've got a fever.....and the only prescription.....IS MORE COW BELL" -The Legendary: Bruce Dickenson "F#$@ 'em up!!!!!!" -The Legendary: Rogelio Escobar TRUCKY LINKS** http://67-72chevytrucks.com/vboard/s...d.php?t=457750 http://67-72chevytrucks.com/vboard/s...d.php?t=461184 http://67-72chevytrucks.com/vboard/s...d.php?t=472848 http://67-72chevytrucks.com/vboard/s...d.php?t=417541 http://67-72chevytrucks.com/vboard/s...d.php?t=477788

07-05-2002, 08:38 PM	#2
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,690	Actually, Your best bet would be to find a multimeter, preferably a digital one. Then start the truck, and do a voltage test across the battery. You should have ideally 13.8 volts going to the battery when the alternator is charging. TJ __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay



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