| Author |
Message |
toddsaint (12.218.69.202)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 25, 2002 - 6:35 am: | |
1973 4905, the batteries are getting too much juice (31vdc) I'm not sure where to make the adjustment. book says 26.5, 28 volts max is what I should have
does changing to a new battery screw up what I had set before?
Todd@gulfcoastaircare.com |
FAST FRED (209.26.87.38)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 25, 2002 - 4:37 pm: | |
IF your GM is like the 12V ones , there is an adjustment on the regulator it self that will adjust the voltage.
I have found in 12V systems that setting the voltage a bit lower than Da Book solves lots if problems.
On long 12 + hour drives the batts tend to over charge, (mostly as we no longer use the 2 huge 80A blowers ) so the big alternator keeps pumping.
Also many GM tend to have a case of charge light blinks.
The red not charging light keeps coming on.
The regulator is trying not to cook the batts , but only when the light is on , are you not charging.
The solution that works for me is to set the charge voltage low at 13.2.
No more boiled batts , no more red light blinking.
NO more burned out expensive halogen headlamp bulbs!
WE have a 2 stage shore charger so at least once a month I charge at 14.2 , overnight, to attempt to disolve any sulphation that might be caused by the low charge.
WE also have a pulse desulphator , so cheap-o Sears starts last 5+ years, no problem.
You might consider doubling the 13.2 for your no hassel Voltage setting.
FAST FRED |
Jayjay (207.30.115.13)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 25, 2002 - 8:42 pm: | |
Todd,the book for my '72 4905 says 27.2VDCis max charge. The voltage regulator is located under a vented cover, high up on the front wall, passenger side of the front baggage bay. You may or may not have to remove the vented steel cover (might be a 1/2" dia. hole in the cover), the regulator is about 3X5" and has a small hole in it. #2 slotted bit screwdriver and CW (if I remember correctly) to increase, and CCW for lower. Try to use a quality digital meter. Go slow with the turning speed, and pause between adjustments. It may help to tap the regulator case gently with the screwdriver handle, then pause to be sure that a change has "settled-in" New battery could cause a change from the old setting, but it would be only a few tenths of a volt, not two or three. Since this basically an analog device, don't try to "chase" the 100ths (second decimal digit), but only be concerned about tenths. Recheck after 5K miles to see if it has "slipped", since 1/2 turn is about 3 volts. G'luck, and Cheers...JJ |
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