My intercooler pump circuit is damages somewhere and the fuse keeps blowing for it. I figure I could use one of these on another fuse that works and then just run the intercooler pump off that? I should think if I find another 10amp fuse that runs with ignition it should be fine?

 

My car is covered in them ..no problem. you need to put them in the right way so the original and new circuit are separately fused. The fuse pins/holder are a bit narrower than some so I had to file mine.

 

Where would you route the neutral wire?

 

I thought the intercooler pump had a bigger fuse than 10A? You've also got a relay that switches the pump on, it sounds like you are going to bypass that, which is a bad idea.

If you are going to run a new cable, why not just run it from the relay direct to the pump and keep the original fuse position?

 

On the 2003 cars and later there is no relay, it's controlled by the ECU.

 

In that case why not run the new wire from the original fuse to the pump? Is there anything else on that fuse?

 

I just figure it would be easier because I know the intercooler wiring is dodgy somewhere down the wire. The problem is it's part of a bigger wiring loom which makes it difficult to follow and to get to. To run new wire to the engine comaprtment fuse box would mean I would have to take the housing out entirely and rewire it from the bottom. Putting a pigtail thing in to another fuse that I know works would be much easier. I just need to route the new wire around the engine bay to the intercooler pump so it's nice and neat.

 

In which case just put the piggyback fuse in the intercooler fuse position, but leave the main fuse empty so you are isolating the damaged circuit.

 

That is a very good idea. I will probably do just that. Plug it into the intercooler pump fuse and route a new wire to the intercooler, not sure where to put the ground wire though, that is the only problem. Either way I will have to modify the fuse box cover so a wire can come out of it, unless there is space under it or a way to get it out other than the lid.

 

Make sure you double check the fuse value - its 20A on mine.

You can probably just re-use the existing ground to the pump and rewire the 12v side.

 

I might try the existing ground wire, I'm just not confiden that that isn't the reason why the fuse keeps blowing. I will just try a few things and see which one is more elegant a solution. These cars are slowly turning into real classic cars where each car has weird wiring in them because thigns go wrong and someone like me comes along and bodges a repair.

 

If it was me I would say leave the original earth or negative supply (there is no neutral on a car) and just feed the live via the piggy back connection clipping the live ...insulate the end.

 

That sounds like a good idea. And relatively easy to do. I will probably just directly wire it quickly to make sure it works and then make it look nicer and hide the wire somewhere tucked away.