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  #1  
Old 12-11-2006, 12:42 PM
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left lights on for 10 mins, battery dead

i left my lights on in my 300D for only 10 mins as i ran inside and now the battery barely turns over the engine. i did install some Euro's about a year ago, and since then have had some dead batteries, but never was able to time a certain incident down to only 10 mins. what is my plan of attack when searching for my short? i do remember that when i installed the Euro's the instructions were not right because the highs and lows were switched on once side and not completely working on the other. I played around with it and got it all right, but i guess must have someting wired wrong.

any suggestions?


btw, this is a 3 month old battery.

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  #2  
Old 12-11-2006, 12:49 PM
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Doesn't sound to me like a short, more like a loose alternator belt or weak charging. What is the cold cranking amps of the battery and reserve capacity? I ask because you might have purchased the wrong type for a diesel.
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  #3  
Old 12-11-2006, 01:13 PM
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i got the biggest battery at autozone (was stuck in their parking lot), and it was the only one that showed up in their system as working for my 300D. 850/1000 cranking amps, and 155 reverse capacity.
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  #4  
Old 12-11-2006, 02:25 PM
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THATS IT! thanks. Check alternator belt tension. Should not be able to rotate pulley against normal rotation by hand if properly adjusted.
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  #5  
Old 12-11-2006, 04:18 PM
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85 300D 4spd+tow+h4
 
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Quote:
Originally Posted by arcticathlon View Post
i left my lights on in my 300D for only 10 mins as i ran inside and now the battery barely turns over the engine. i did install some Euro's about a year ago, and since then have had some dead batteries, but never was able to time a certain incident down to only 10 mins. what is my plan of attack when searching for my short? i do remember that when i installed the Euro's the instructions were not right because the highs and lows were switched on once side and not completely working on the other. I played around with it and got it all right, but i guess must have someting wired wrong.

any suggestions?


btw, this is a 3 month old battery.
You need to check resistance I believe.

http://www.google.com/search?hl=en&safe=off&client=firefox-a&rls=com.ubuntu:en-USfficial&hs=vBs&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=multimeter+101+finding+a+short&spell=1


I am betting its a short, especially if you had problems wiring it up. Were the lights modified at all?
How did you wire the day time running lights?
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  #6  
Old 12-11-2006, 04:28 PM
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Mine wouldn't last 10 minutes with the lights on. Sears replaced the battery for free yesterday. It was two years old. It just wouldn't hold a charge any more. I was pretty hard on it this last year.
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  #7  
Old 12-11-2006, 04:50 PM
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Short = Blown Fuse

Folks,

If the headlights had a short, or are drawing an excessive amount of current, you would be blowing fuses.......assuming that you have the proper fuses in place......

the following is for an 85 300D

Fuse #7......8 amp, white.........Headlight (RH High Beam)
Fuse #9......8 amp, white.........Headlight (LH High Beam) and Indicator
Fuse #11....16 amp, red...........Headlights (RH Low Beam and Fog Ligts)
Fuse #13....8 amp, white..........Headlight (LH Low Beam)

copied exactly as written in MB W123 Electrical Troubleshooting Manual

So, If you didn't connect those lights up directly without any fuse......then you should be having some fuse problems......if you have some sort of short!!

If it were me, I would get a voltmeter and check my Alternator's output...there are several threads relating to this......

I would also check my ground straps.....

I assume that you gave the parts store your old battery, in lieu of a core deposit......but I would have fully charged the battery, slowly, overnite....then tested it with my trusty Snap-On Resistance type Battery Load tester......

Luck to ya.....especially if you have custom improved on the factory MB headlight power distribution system.....

SB
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  #8  
Old 12-11-2006, 06:30 PM
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I agree. It would blow a fuse. Why do people still get a short and a battery draw confused? Headlights on for ten min. is a battery draw! Headlight quitting and finding a blown fuse is a short! A headlight not working and no power to it is an open! For some reason your battery did not have enough reserve in it to restart, so the battery's correct, right. so why was it weak? Check alternator output voltage as well as amperage and ck belt tension. Then report back with the test results so we can help. Be aware that all these tests are to be done with a fully recharged battery, not before!
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  #9  
Old 12-11-2006, 07:32 PM
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Quote:
Originally Posted by Shorebilly View Post
If it were me, I would get a voltmeter and check my Alternator's output...there are several threads relating to this......

I would also check my ground straps.....

Seconded, my money is on a weak alternator.

PS. you can get a multimeter @ harbour freight for $4.99
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  #10  
Old 12-11-2006, 08:07 PM
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Thumbs up

Remember, maintenance free batteries need to charge differently.

If I am doing lots of city driving in the MBs, I always go for a cruise after to get it really charged up and to get the motor good and hot.
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  #11  
Old 12-11-2006, 08:55 PM
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just as likely he had a poor connection on old battery and putting in the new battery miraculously fixed the alternator
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  #12  
Old 12-11-2006, 11:44 PM
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I have pretty much the same issue on my 87 300D. My money is on my battery being just plain old. It is 10+ years old and is due to be replaced. For some silly reason I just can't seem to make myself get it done. Maybe it is the MB 3 point star on the battery. I just don't know. For now I'm keeping 100ft of 12 gauge extension cord and my 2/10-30/60 amp start assist/battery charger in my trunk.

I know, just replace it.

-Jim
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  #13  
Old 12-12-2006, 06:59 AM
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Elektrizity is Magik !!

Quote:
Originally Posted by carnut View Post
I agree. It would blow a fuse. Why do people still get a short and a battery draw confused?
Electricity is Magic!!!!

SB
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Gassers:
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  #14  
Old 12-12-2006, 10:28 AM
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Quote:
Originally Posted by Shorebilly View Post
Electricity is Magic!!!!

SB
naw, it's not magic, it's just that when the wires are all crossed and crunched, the power gets all spilled out and stopped up and stuff...
John
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  #15  
Old 12-12-2006, 08:38 PM
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Quote:
Originally Posted by Shorebilly View Post
Electricity is Magic!!!!

SB
You are correct in your statement Electricity is Magic, All electrical components run on smoke, because once you let the smoke out, they never work again

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