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  #1  
Old 09-04-2015, 03:01 PM
mbzr4ever's Avatar
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Electrical issue close to getting solved?

Connected a light pen from to neg cable to neg post to observe when light would go out when fuses were taken out.

Discovered the removal of 9 would make the light go out, but ..

only when C and 9 we both out at the same time.

If 9 was taken out, but C was left in, the light would stay on.

9 controls the diagnostic module, among many other functions.
(Started with http://www.peachparts.com/shopforum/tech-help/366497-check-engine-light-after-key-out.html)

Noticed the transmission selector lever position light is not working - controlled by 9 also!

What does this mean and what should I do next?

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1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

2000 Ford Ranger, 187K

2015 Dodge Ram 1500 EcoDiesel 37K

Last edited by mbzr4ever; 09-04-2015 at 03:37 PM.
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  #2  
Old 09-05-2015, 12:11 PM
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Might help if you said what the electrical issue was???

Or in other words, what is the problem with your electrical system?
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  #3  
Old 09-05-2015, 06:56 PM
mbzr4ever's Avatar
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Started with the check engine light staying on - even when the key was out.

To the point where the battery drained overnight - regardless if CEL was on or off.

First, I was focused on resolving the CEL - but I have no fault codes now.

Am trying to pinpoint the battery drain, but am confused about the C and 9 combination.
__________________
1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

2000 Ford Ranger, 187K

2015 Dodge Ram 1500 EcoDiesel 37K
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  #4  
Old 09-07-2015, 11:46 AM
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Ok, you are best to use an amperage meter. Some things in cars are always on and always use a little electricity. Like a radio - needs to have "standby" power for the memory to remember the stations selected.

So those things will use very little electricity from the battery. A malfunction which will drain the battery will be using a LOT of electricity. You can tell the difference with an amperage meter.
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  #5  
Old 09-07-2015, 07:16 PM
mbzr4ever's Avatar
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Thanks for explaining the details on why an amperage meter should be used in further analyzing this drain.

In researching, found a thread on the radio causing the drain:
http://www.peachparts.com/shopforum/tech-help/368174-battery-drain.html

Is this situation possible for an aftermarket installed years ago with no problems but
now causing a drain?

In other words, if the radio was installed a long time ago and the battery drain is a new problem, should the radio still be examined as a possible drain source?
__________________
1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

2000 Ford Ranger, 187K

2015 Dodge Ram 1500 EcoDiesel 37K
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  #6  
Old 09-08-2015, 10:26 AM
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Anything can cause a large battery drain if there is a malfunction. That is the reason to use an amp meter so you can trace the problem to its source - whatever it is.

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