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08 ML 320 CDI, 99 ML320 V6, 00 CLK430 Cab
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534 Posts
Discussion Starter #1
I want to install a train horn on my ML for those who like to sit at green lights looking at their phones. It needs a direct 12 v source. Think it's ok to use these posts?
 

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Registered
2007 E320 Bluetec, 2008 320ML CDI
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2,438 Posts
I’d say yes. It’s where you apply volts if needed to jumper a low battery and it’s where I connect the charger when needed.


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W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
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1,342 Posts
You could use those posts as they are connected directly to the battery. It might be cleaner to go through the fusebox, like normal though. Make sure you use an inline fuse and a relay in case something shorts!
 
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