Which battery cable is positive/negative??? 450SLC 1980 - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 06-08-2011, 06:14 PM Thread Starter
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Question Which battery cable is positive/negative??? 450SLC 1980

Hello,

So gotta admit, I'm pretty parallel when it comes to cars. However, I got stuck with a Mercedes 450 SLC from 1980...so why not use it??

First thing....it didnt have a battery. So I went to Walmart, flipped through their catalog and found/bought the battery.

I put it in the trunk (apparently thats where the battery goes on this model). Now, I know which end is + and which is - on the battery, but I am not sure which cable is + and which is - from the car to the battery.

I wanted to double check before I turn the key and cause any damage to the car or myself. I'll attach some pics for the fun of it.

The way the car cables are...there is a short one and a longer one. The way the battery fits, makes sense the short one is positive and long one negative but i wanted to make sure.

Thanks in advance.
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post #2 of 7 (permalink) Old 06-09-2011, 06:59 AM
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Originally Posted by varteju View Post
Hello,

So gotta admit, I'm pretty parallel when it comes to cars. However, I got stuck with a Mercedes 450 SLC from 1980...so why not use it??

First thing....it didnt have a battery. So I went to Walmart, flipped through their catalog and found/bought the battery.

I put it in the trunk (apparently thats where the battery goes on this model). Now, I know which end is + and which is - on the battery, but I am not sure which cable is + and which is - from the car to the battery.

I wanted to double check before I turn the key and cause any damage to the car or myself. I'll attach some pics for the fun of it.

The way the car cables are...there is a short one and a longer one. The way the battery fits, makes sense the short one is positive and long one negative but i wanted to make sure.

Thanks in advance.
You don't have to wait until you turn the key, the damage has happened already before that (if you did not connect it right).

The battery poles are of different size, you can even try it as long as you try only one cable at a time. Better to check which one is attached to the body, that would be the minus (ground) cable.
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post #3 of 7 (permalink) Old 06-11-2011, 07:29 PM
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Suggestion: Do NOT shop at Walmart for parts for a Mercedes ... especially if you are not 100% sure of what you need, or what the vehicle requires.

With that aside, make sure the battery HOLD DOWN / TIE DOWN is still in place. You do not want the battery to be loose, or come loose during travel.

Steven Long, MBCA Delaware Valley Section
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post #4 of 7 (permalink) Old 06-12-2011, 12:09 PM
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Just verify, as stated above, which cable is attached to the chassis ground/negative.
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post #5 of 7 (permalink) Old 06-12-2011, 05:24 PM
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Using a multimeter

check each cable for continuity to a convenient body/chassis point. The ground (-) cable will show a short to that point. The positive (+) cable will not.
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post #6 of 7 (permalink) Old 06-12-2011, 11:44 PM
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Originally Posted by rocky raccoon View Post
check each cable for continuity to a convenient body/chassis point. The ground (-) cable will show a short to that point. The positive (+) cable will not.
One would have to be careful with this method. Any consumer switched on would actually "short circuit" the positive cable to ground. It would not be exactly 0 ohm but could be difficult to figure out with an ordinary multimeter.

Edit: I did not feel necessary to post a new message but generally one should note that switching ignition off (which is most likely the case by default when the battery is disconnected) does not switch off all consumers meaning there can be significant load on the circuit 30 even if ignition is off. This is specifically the case for modern cars, on a 1980 SLC perhaps nothing remains on (if it does not have any alarm etc.).

Last edited by Diesel Benz; 06-14-2011 at 12:07 AM.
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post #7 of 7 (permalink) Old 06-13-2011, 05:26 PM
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Of course.

This check must be done with ignition switch off and cables disconnected at the battery end. Trying to measure continuity on a line with voltage on it is likely to damage the multimeter.
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