battery draining. Can't find the draw
#3075560
09/08/22 05:03 PM
09/08/22 05:03 PM
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Joined: Feb 2006
Posts: 1,179 Canada
demon
OP
super stock
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OP
super stock
Joined: Feb 2006
Posts: 1,179
Canada
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Working on a 78 Chrysler LeBaron. It's a low mileage car, absolutely stock and untouched, other than it has had an electronic ignition conversion to eliminate the Lean burn system. So the issue is: The battery will go dead in a day or so.
Brand new battery.
With the key off, doors and trunk closed, and checked to make sure no lights are on. I pulled off the negative cable, and put a test light between the negative battery post, and the negative cable. The test light is bright. I then pulled every fuse out one by one, and no change. Test light still on. Disconnected various items such as alternator, electronic control box, wiper motor, power seat, and still no change. Anyone have an idea as to what is drawing power?
Last edited by demon; 09/08/22 05:05 PM.
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Re: battery draining. Can't find the draw
[Re: Sniper]
#3075576
09/08/22 06:24 PM
09/08/22 06:24 PM
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Joined: Apr 2007
Posts: 2,924 Calgary, Alberta Canada
a12rag
master
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master
Joined: Apr 2007
Posts: 2,924
Calgary, Alberta Canada
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Years ago I had a similar issue. Turns out I put new trunk weatherstripping on and it held the trunk lid up enough to allow the light to remain on. Unless you get in the trunk and have someone shut it it's real hard to tell. I guess you could pull teh bulb and see if the battery drains.
I have a 64 Falcon that has trunk light with a "mercury" type switch - switch was bad and would keep light on . . . would try above for sure
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Re: battery draining. Can't find the draw
[Re: demon]
#3075591
09/08/22 07:05 PM
09/08/22 07:05 PM
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Joined: Jan 2003
Posts: 5,448 So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,448
So Cal
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Just a suggestion... Pop off each bulkhead connector, 1 by 1.... See if the light goes OFF.. This may point U in the right direction.. Just my $0.02....
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Re: battery draining. Can't find the draw
[Re: 71GTX471]
#3075594
09/08/22 07:31 PM
09/08/22 07:31 PM
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Joined: Jan 2011
Posts: 15,945 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,945
Central Florida
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Disconnect the alt.leads & see it could be shorted. This. My '89 Diplomat fought me with this and it was the alternator.
Facts are stubborn things.
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Re: battery draining. Can't find the draw
[Re: NITROUSN]
#3075626
09/08/22 09:05 PM
09/08/22 09:05 PM
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Joined: Jan 2003
Posts: 1,894 Harriman NY
71GTX471
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,894
Harriman NY
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Read ....He has disconnected the alternator. My bad missed that.
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Re: battery draining. Can't find the draw
[Re: demon]
#3075657
09/08/22 10:36 PM
09/08/22 10:36 PM
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Joined: Jan 2003
Posts: 15,540 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,540
Omaha Ne
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I had one years ago on 63? T bird. Couldn't find it. It had the older analog clock that had points. When the clock spring needed to wound the points would close, wind the spring and the points would open. OK but this clock wasn't working so I blew by it. After chasing my tail for a few hours a buddy suggested disconnecting the clock. I said why? it's not working Well lo and behold the points were stuck shut, which overwound the spring until it broke, so the clock motor was running all the time. But you couldn't hear it and I ASSumed it was not the issue. might try the bulkheads as suggested as it might narrow it down. I would start with the wiper motor harness. It has to be something that is hot all the time and not fused by the fuse box A schematic would be very helpful as wellKeep us posted
Last edited by TJP; 09/09/22 09:26 PM.
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Re: battery draining. Can't find the draw
[Re: TJP]
#3075661
09/08/22 10:43 PM
09/08/22 10:43 PM
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Joined: Jan 2003
Posts: 10,763 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,763
North Dakota
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Trying to shotgun electrical problems usually never ends well. Get a wiring diagram for your car. Based on that, start removing components one by one until the problem is found. I've been through this more than once and this typically has worked best for me.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: battery draining. Can't find the draw
[Re: demon]
#3075667
09/08/22 11:28 PM
09/08/22 11:28 PM
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Joined: May 2006
Posts: 1,757 Phila
PhillyRag
top fuel
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top fuel
Joined: May 2006
Posts: 1,757
Phila
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Working on a 78 Chrysler LeBaron. It's a low mileage car, absolutely stock and untouched, other than it has had an electronic ignition conversion to eliminate the Lean burn system. So the issue is: The battery will go dead in a day or so.
Brand new battery.
With the key off, doors and trunk closed, and checked to make sure no lights are on. I pulled off the negative cable, and put a test light between the negative battery post, and the negative cable. The test light is bright. I then pulled every fuse out one by one, and no change. Test light still on. Disconnected various items such as alternator, electronic control box, wiper motor, power seat, and still no change. Anyone have an idea as to what is drawing power? Some circuits are not fused: HL,park,etc. Focus on those type circuits.
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Re: battery draining. Can't find the draw
[Re: PhillyRag]
#3075685
09/09/22 02:05 AM
09/09/22 02:05 AM
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Joined: Dec 2005
Posts: 11,739 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,739
Fulton County, PA
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Just have to keep disconnecting stuff until it disappears. Relays, Connections. As stated, firewall connections to try to isolate it.
If the results don't match the theory, change the theory.
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Re: battery draining. Can't find the draw
[Re: 6PakBee]
#3075687
09/09/22 03:46 AM
09/09/22 03:46 AM
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Joined: Jan 2003
Posts: 2,744 541 slobovia
A990
master
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master
Joined: Jan 2003
Posts: 2,744
541 slobovia
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Trying to shotgun electrical problems usually never ends well. Get a wiring diagram for your car. Based on that, start removing components one by one until the problem is found. I've been through this more than once and this typically has worked best for me. This This THISIt helps you establish a map so you can isolate and work each circuit rather than get lost and chase your tail. You will be surprised at what else you may find that was goofed up by a prior owner as well.
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Re: battery draining. Can't find the draw
[Re: demon]
#3075706
09/09/22 08:41 AM
09/09/22 08:41 AM
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Joined: Jan 2003
Posts: 1,613 westerly, ri. usa
440lebaron
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,613
westerly, ri. usa
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there is a relay (3 wires) for the alternator, under passenger fender, has battery voltage at all times, unplug that
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Re: battery draining. Can't find the draw
[Re: 440lebaron]
#3075739
09/09/22 10:18 AM
09/09/22 10:18 AM
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Joined: Feb 2006
Posts: 1,179 Canada
demon
OP
super stock
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OP
super stock
Joined: Feb 2006
Posts: 1,179
Canada
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there is a relay (3 wires) for the alternator, under passenger fender, has battery voltage at all times, unplug that I'll check that. Thanks for everyone's input. The owner bought the car recently from an estate, so he doesn't know much about it. The car is very low mileage and in excellent untouched condition. The digital clock does not function though, so I do wonder if that is possibly drawing power
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