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  #1  
Old 06-21-2022, 11:13 AM
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Disconnect the battery WITHOUT disconnecting the battery?

Yeah, stupid question I know but I'm a bit stuck here.

I've got a 2001 4.4i with an LPG tank in the spare wheel area so I can't get to the battery.

The battery light came in the other night due to the alternator going bang so it needs replaced.

I can't disconnect the alternator without disconnecting the battery, and I can't get to the battery

Is there a way anybody can recommend for doing this?

Thanks in advance.

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  #2  
Old 06-21-2022, 11:25 AM
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That was an ill-thought out installation. Why not move the battery when the LPG installation was happening? You're going to have to change that battery eventually.

Sorry to say, you're going to have to lift that tank. How much does it weigh?

BTW, I'm not knocking you, I have the same problem but with a huge stereo setup. So to change my battery I have to uninstall about 100lbs worth of gear. Such is life. I did install a battery cutoff switch, but I don't look forward to the day the X5 needs a new battery.
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Old 06-21-2022, 11:43 AM
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You should be able to replace the alternator without disconnecting the battery. Make sure you have a roll of tape handy when you take the battery terminal off don't let go of it until you wrap it with tape in your other hand. Also I think the alternator cable is connected at the underhood boost terminal so you could undo that as well.

I've replaced alternators on the X5 (twice) and the X3 (both 6 cyl though) without disconnecting the battery. Just be careful and plan it out so you don't need to let go of the cable to get to the tape!
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Old 06-21-2022, 11:45 AM
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Quote:
Originally Posted by 80stech View Post
You should be able to replace the alternator without disconnecting the battery. Make sure you have a roll of tape handy when you take the battery terminal off don't let go of it until you wrap it with tape in your other hand. Also I think the alternator cable is connected at the underhood boost terminal so you could undo that as well.
Thanks for the reply.

Yeah I did think about that but I wasn't sure, I don't want to break it more than its broken.

You reckon it's safe enough?

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Old 06-21-2022, 11:57 AM
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Can you access the negative terminal where it grounds on the rear left of the trunk well - when looking at it from tailgate ?

If you don’t need to replace the battery, you can disconnect it by unbolting the ground to body connection.
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Old 06-21-2022, 12:21 PM
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Quote:
Originally Posted by Effduration View Post
Can you access the negative terminal where it grounds on the rear left of the trunk well - when looking at it from tailgate ?

If you donít need to replace the battery, you can disconnect it by unbolting the ground to body connection.
That would be your easiest method. It looks like you might be able to reach it at the top left (going towards that fuse box on the chassis where the thick positive cables run) of your LPG tank. I think it's a 13mm nut on a stud. You'd have to tape that so it doesn't accidentally earth on something while you're doing the alternator.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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Old 06-21-2022, 02:55 PM
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Why not just undo the connection at the jump cable point on the firewall? That way the engine parts are all non-live.
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