generator light is dimly on and no charging battery question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BCOWANWHEELS · 02-09-2008, 10:35 AM

well i need help again..... i pulled in the driveway and my generator light in the dash came on dimly.... so i unhooked the battery and the engine died so i figured the alternator was bad. i took it off and got a new one and still have the same problem ! then i got a new voltage regulator and installed it, same problem didnt help a thing. anybody got any tips to trouble shoot my problem ? all fuses are good. checked wireing and no apparent problems. i need help !!!!
bob

68gmsee · 02-09-2008, 10:43 AM

Been there done the same thing on my GMC. A second voltage regulator fixed mine, though. The guy told me that the alternator damaged my original so when I replaced the alternator I should have also replaced the voltage regulator. Hopefully yours is the same problem.

68gmsee · 02-09-2008, 10:49 AM

Just reread your post. You did replace the voltage regulator after the new alternator. It still could be a new defective regulator or even alternator. A long time ago I had to replace a voltage regulator twice. The new ones are electronic circuitry and can be easily damaged by a short.

BCOWANWHEELS · 02-13-2008, 08:57 AM

well i cant seem to find the dog gone short or ground in my charging system so today i went and bought a 105 amp, 1 wire alternator and i,am gonna install it tomarrow and be done with it all. man wireing problems are buggers....
bob

463 · 02-13-2008, 10:52 AM

a quick check to see if the alternator is charging is to take a screwdriver and put the tip to the rear bearing cap when the truck is running if is pulled in (magnetized) the system is charging. voltage regulator & alternator should be both changed out at the same time. here is a link on this forn that has the alternator change up to the internal regulated alternater. this is what i did last fall (should have did this 20 years ago) nice easy change up and best of all 14.7 volts. link:http://67-72chevytrucks.com/vboard/s...=119379&page=2

BCOWANWHEELS · 02-14-2008, 12:20 PM

all i did was go to my local alternator rebuilder and get a 105 amp gm 1 wire alternator. it bolted right on. then i unpluged the voltage regulator, cut the large red wire near the plug, spliced a piece of # 10 wire to it where i cut it and ran it to the terminal on the back of the alternator. all done. works perfect. i do think i,am gonna install a volt or amp gauge under my dash though soon. total cost $59.00
bob

02-09-2008, 10:35 AM	#1
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	generator light is dimly on and no charging battery question... well i need help again..... i pulled in the driveway and my generator light in the dash came on dimly.... so i unhooked the battery and the engine died so i figured the alternator was bad. i took it off and got a new one and still have the same problem ! then i got a new voltage regulator and installed it, same problem didnt help a thing. anybody got any tips to trouble shoot my problem ? all fuses are good. checked wireing and no apparent problems. i need help !!!! bob __________________ I BELIEVE IN JOHN 3:16

02-09-2008, 10:43 AM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: generator light is dimly on and no charging battery question... Been there done the same thing on my GMC. A second voltage regulator fixed mine, though. The guy told me that the alternator damaged my original so when I replaced the alternator I should have also replaced the voltage regulator. Hopefully yours is the same problem.

02-09-2008, 10:49 AM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: generator light is dimly on and no charging battery question... Just reread your post. You did replace the voltage regulator after the new alternator. It still could be a new defective regulator or even alternator. A long time ago I had to replace a voltage regulator twice. The new ones are electronic circuitry and can be easily damaged by a short.

02-13-2008, 08:57 AM	#4
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: generator light is dimly on and no charging battery question... well i cant seem to find the dog gone short or ground in my charging system so today i went and bought a 105 amp, 1 wire alternator and i,am gonna install it tomarrow and be done with it all. man wireing problems are buggers.... bob __________________ I BELIEVE IN JOHN 3:16

02-13-2008, 10:52 AM	#5
463 Registered User Join Date: Nov 2007 Location: Sask Canada Posts: 1,666	Re: generator light is dimly on and no charging battery question... a quick check to see if the alternator is charging is to take a screwdriver and put the tip to the rear bearing cap when the truck is running if is pulled in (magnetized) the system is charging. voltage regulator & alternator should be both changed out at the same time. here is a link on this forn that has the alternator change up to the internal regulated alternater. this is what i did last fall (should have did this 20 years ago) nice easy change up and best of all 14.7 volts. link:http://67-72chevytrucks.com/vboard/s...=119379&page=2

02-14-2008, 12:20 PM	#6
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: generator light is dimly on and no charging battery question... all i did was go to my local alternator rebuilder and get a 105 amp gm 1 wire alternator. it bolted right on. then i unpluged the voltage regulator, cut the large red wire near the plug, spliced a piece of # 10 wire to it where i cut it and ran it to the terminal on the back of the alternator. all done. works perfect. i do think i,am gonna install a volt or amp gauge under my dash though soon. total cost $59.00 bob __________________ I BELIEVE IN JOHN 3:16



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