Thinking of buying a 2008 GL450 with electrical issue

There's a very nice 2008 GL450 for $6500 I'm looking at, but it has an electrical issue that was draining the battery, so the previous owner installed a switch under the passenger seat. What kind of trouble do people think this is? Also, it has 175k miles on it, what do I need to look for? Are these decent cars for the mechanically inclined? I don't drive too much either. Wondering about opinions on this model's reliability and cost and any other opinions about it! Thank you!

There's a very nice 2008 GL450 for $6500 I'm looking at, but it has an electrical issue that was draining the battery, so the previous owner installed a switch under the passenger seat. What kind of trouble do people think this is?

Also, it has 175k miles on it, what do I need to look for? Are these decent cars for the mechanically inclined? I don't drive too much either.

Wondering about opinions on this model's reliability and cost and any other opinions about it!

Thank you!

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