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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Jul-22-2017, 01:41:40 PM   #1
stack
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Default Battery Cable HOTTTTT

I was just checking things under the hood, when I noticed a melted wire for the angel eyes which i disconnected and don't use.

I go to touch the 19mm nut for the battery cable
And it's pretty darn hot

Any ideas on what could cause this.



I still get proper voltage.
It's only warm/hot in that area
Further back in the firewall it's normal and heading up towards the fuse box is normal also


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Old Sat, Jul-22-2017, 03:07:25 PM   #2
TheSt|G
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Default Re: Battery Cable HOTTTTT

Nice meter.

Heat typically indicates resistance, which usually is a result of corrosion. How many ohms of resistance are you getting in that wire?
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Old Sat, Jul-22-2017, 05:08:04 PM   #3
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Default Re: Battery Cable HOTTTTT

I'd take the nut off and clean the connections up
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Discussing e46 M3 Maintenance Thread in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)