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2002 Mit Magna Parasitic drain
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PeteM
New User
Jul 17, 2024, 5:53 PM
Post #1 of 2
(638 views)
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2002 Mit Magna Parasitic drain
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Hi all,
I have not done the trace the drain et, but thought i would post first as i have never seen one like this before, but also have not played much with Magna wiring.
1) Fuel gauge stopped working correctly. Only shows full for 50 to 60 km after refuelling to max, then over the next 30 km, goes from full to zero.
2) Car goes from 12.9v when switched off, to 7.7v, but only if central locking is used via keyring dongle. Over 6 to 7 hours.
3) Don't lock the car and the drain occurring over the same time period in only down to 12.1
The whole scenario started after the first really cold morning a few weeks back that was the last gasp for the battery.
Will be looking at the amp draw testing over the weekend, and seeing what i find.
But i would like to know if anyone has seen similar. I think i might be chasing a few culprits.
Thank you.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 17, 2024, 7:15 PM
Post #2 of 2
(630 views)
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Re: 2002 Mit Magna Parasitic drain
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These days there's really no such thing as past experience diagnosis. Even when the same component fails, it can fail in many different ways. Everything needs to be systematically diagnosed.
Your first step should be to have the battery itself tested and only after you have a confirmed good battery you move onto parasitic draw testing.
When you get to that point follow these instructions.
BATTERY DRAW PROCEDURE
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 30 to 40 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.
Note that the act of pulling fuses will often restart some timers so you may have to wait for them to expire if that happens
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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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