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Peugeot 505, Battery drains flat fast, after welding exhaust
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peter4922
New User
Aug 13, 2009, 12:49 AM
Post #1 of 3
(2548 views)
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Peugeot 505, Battery drains flat fast, after welding exhaust
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Hi,
CAR:
Peugeot 505 GTI
Year: 1984
Engine: 2.1l
Mileage: 110000km.
PROBLEM:
Yesterday I had the exhaust repaired using an arc welder. When I left the garage the car was working fine. The car was parking at home in the garage. About 3 hours later the car would not start and the battery was flat. I recharged the battery for an hour. The car started immediately.
Before the exhaust was welded the car was not used for more than 24 hours but the car started immediately. In the previous week the car stood unused for more than 3 days but started immediately.
All electronics / electrical components seem to be working. Lights, radio, window screen widers, electric windows, fuel pump relay, fuel injection all are working (once the battery is recharged)
QUESTION: Did the arc welder break something on the car ? Any suggestions what can be broken and how to locate the fault ? How do I test the battery (I have a multimeter) ?
Here are other details that might help.
DETAILS: I was watching the welders. I did not see any wires near the place where they welded. The welders did mount a bracket on the exhaust pipe. The bracket is connected to the car body using a metal screw and bolt. Around the screw and bolt is rubber which cushions the exhaust. The bracket is the original part but the screw-bolt-rubber is new.
DETAILS: I suspect that there is a short circuit which over a few hours drains the battery. This is an old car. Many mechanics have fiddled with it. Perhaps, the exhaust pipe is accidently connected to the battery's positive terminal and the cars body is connected to the negative terminal. Perhaps the screw and bolt with the rubber no longer insulates the exhaust from the car's body.
Thanks for any help.
Peter
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 13, 2009, 3:21 AM
Post #2 of 3
(2543 views)
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Re: Peugeot 505, Battery drains flat fast, after welding exhaust
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I really doubt the welding had anything to do with it unless it burned out the diodes in the alternator and the alternator is drawing on the battery.
There is a procedure for finding a battery draw like that.
You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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peter4922
New User
Aug 19, 2009, 6:06 PM
Post #3 of 3
(2524 views)
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Re: Peugeot 505, Battery drains flat fast, after welding exhaust
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Thanks for the help. Looks like the central locking is drawing quite a bit of current. Nothing I can do about that.
It also turned out that the battery was broken (one cell was finished). So I replaced the battery. I've left the car standing for a few days. So I'll see if something is still draining the battery unreasonable.
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