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I have an electrical short that can drain my battery over a three day period. I tested for a short, with a probe, at the fuse panel. With the ignition off I registered power on the Crtsy circuit and the LCD circuit. I believe that the Crtsy circuit is supposed to have power, but don't know whether there should or why there would be power to the instrument panel when the ignition is off. Does anyone have any insights or suggestions.
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Send PMLanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 2191
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
is there anything else on that circuit like a clock?i dont have the same instrument panel as you so i cant check mine. could be something else doing it unless you pulled the fuse and let the car sit for a longer period than three days and it started. how old is the battery? an older battery can do it. dont forget there are more electrical systems in these cars. another thing you may want to check is the output of the alternator.when mine did it the output was about 13.7 volts which a friend who scanned it for me (after i bought it) said it was kind of a low reading. replaced it and stopped having the problem.
eddie20890 2011-07-02 18:45:42
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Send PMHuron, OH - USA
Joined: 12/5/2009
Posts: 179
Vette(s): 1989 Red Convertible - 160,000 fun-filled miles -
on my '89 dash panel, there's constant power to the dash panel and I believe it's for the climate control memory settings - temp, fan speed, etc. I think the '88 panel is the same
coincidently, my 2 year old battery wasn't holding a charge for more than a week this spring. like you I looked at other things as being the cause and found nothing, so I got a new battery and all is well. previous battery was a name brand and came from wally-mart on sale. this time i went back to a Napa battery.
good luck and keep us posted - everybody appeciates hearing the conclusion to any problem
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
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The LCD fuse should be hot all the time. It keeps the processor memory alive in the cluster. It should only have around 18-22 milliamp draw on it, key off.
One thing...never use a test light to check any of the circuits on the cluster...use a good multimeter. A test light can give false info, as well as damage some sensitive circuitry in the processor. Checking the fuse with a light is ok, but it will not show the exact voltage going thru the fuse. The test light will light up with 8volts, so you'll assume the fuse is good, but the system will not work properly with less than 12 volts.
I have a good article on finding battery drain issues somewhere. I'll see if I can locate, and post it. It may be at the shop....
One thing...never use a test light to check any of the circuits on the cluster...use a good multimeter. A test light can give false info, as well as damage some sensitive circuitry in the processor. Checking the fuse with a light is ok, but it will not show the exact voltage going thru the fuse. The test light will light up with 8volts, so you'll assume the fuse is good, but the system will not work properly with less than 12 volts.
I have a good article on finding battery drain issues somewhere. I'll see if I can locate, and post it. It may be at the shop....
Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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can you take a test light and go inbetween the negitive battery post and the negitive cable. if the light is on then you have an battery draw. pull each fuse one at a time when the light goes off you know what cir...it's comeing from. then check for opptions like clock , lights among other things. this is only my oppinion
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in Forum: C4 Electrical, Body and Interior
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