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A fuse is designed to go when the current reaches the fuse rating A fuse has designed internal resistance, as has the connecting cable of course but the fuse should be the weakest point in the circuit for obvious reasons. Current flowing in a circuit will, because of the fuses resistance, heat...

Wow, that's one mighty crowbar. I will try that and see what happens

The aux battery when flat has a higher internal resistance and this will prevent the rush of current.

Here's a quickie that I used to use when I was teaching electrics to new recruits who had little idea about the subject and Ohms law was something that the old bill knew about if they wanted to give them a hard time. Most people understand water so ... Pressure in a system is the head of water...

One of the questions that I am often asked is "How can I separate my Auxiliary battery from my main battery so that I can use a winch or powered 12volt accessories but still get the battery charged when the engine is running?". The assumption here is that you have got or want a secondary...

The offside bonnet hook on the bulkhead is really badly damaged, The hook is no longer a proper hook and despite my best efforts with club hammer is determined not to bend back to shape. Are these a replacement part does anyone know and are they welded on or nutted on the back. I am struggling...