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Merc 30 Litre blowing 15 Amp fuse

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I have a 2007 Merc 3.0 litre T

I have a 2007 Merc 3.0 litre TKS where the 15 Amp use keeps blowing on the engine. It is the fuse that protects the circuit that goes up to the key switch and provides power for the start and ignition circuits. Has anyone else seen the same problem?
 
"Yes - I had the same problem.

"Yes - I had the same problem. Tighten the nuts which the ignition wires are stacked on, located underneath the dash."
 
"The ignition goes from key wi

"The ignition goes from key witch to gauge to gauge and so forth. Which nuts do you mean, or do you mean all of them?"
 
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