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BATTERY DRAIN IN 3 DAYS

JohnnyJ

Active member
Joined
Sep 24, 2002
Messages
40
Location
SC
On my 79 Corvette the battery drains if the car is not run for 3 days. Any advice on how to find the problem?
 
T

tonyvdb

Guest
First think would be to make sure it's not the battery that is the problem. If you have an amp gauge see if its drawing any amperage with everything shut off. If it is you could start pulling fuses and see if it make a difference. If you find pulling one stops the draw then you have found the circuit that has a problem.
 

LVMYVT76

Well-known member
Joined
Apr 21, 2006
Messages
664
Location
springfield, mo
Corvette
1976 medium blue
could be a week cell in the battery, disconnect the battery and charge it correctly, and have it checked. If it checks good, you may a interior light that is on, like a map light accidently turned on or a gove box not shut all the way letting the light stay on. I gave up on delco batteries because they would have bad cells in less than 6 months, changed to a differeent company, now no trouble.
 
1

1stC3Vette

Guest
First think would be to make sure it's not the battery that is the problem. If you have an amp gauge see if its drawing any amperage with everything shut off. If it is you could start pulling fuses and see if it make a difference. If you find pulling one stops the draw then you have found the circuit that has a problem.

That is exactly how I did it on my brothers '76. Place the meter between the negative battery post and the negative battery cable. Note the amount of current draw, then pull each fuse until it goes to zero or very close to it (.01 or less). Do not try to run the windows or start the car like this.

Good luck,
Dino
 
Joined
Apr 8, 2005
Messages
274
Location
Charleston, SC
Corvette
1981 Dark Blue Metallic, 2003 AE coupe
A bad cell will definitely be a problem. A fully charged 12v battery should actually read about 14v when unloaded. A bad cell could still give you around 11 or 12 volts and it looks like the battery is ok, but when it gets loaded down by the starter, it just can't handle the amp draw. Another place to look for the phantom light is on the vanity mirror on the passenger sunvisor if you have one. Good luck!

Mike :w
 

JimVette

Well-known member
Joined
Jun 9, 2004
Messages
176
Location
gulf Breeze Fl
Corvette
1992 Red ZR1
First let me say that AC DEelco batteries suck. I have the ZR1, a Trailblazer and a Camaro and none of the batteries lasted more than 2-3 years. Second look at the power window switches in the up position. The only way I found it bad was to disconnect the battery and when hooked up you could hear the switch engage, up side only. Good luck
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
A fully charged 12v battery should actually read about 14v when unloaded.

A fully-charged battery will normally show 12.4-12.8 volts across the terminals engine-off, and 13.5-14.5 volts across the terminals with the engine running if the regulator is working properly.

:beer
 

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