400 fuse board issues

Hi guys,

I'm trying to do a simple repair on a 400 fuse board but need a hand for some info. I've written an article on reparing the Testarossa fuse board and the 400 one is very similar but I don't have any information on the schematics of the 400 board.

The Testarossa overloads a couple of curcuits which causes damage to the pins and connectors on the board, those long white plastic plugs that fit into the board. This in turn burns the tracks on the boards themselves, which can be repaired by hard wiring internally.

For those that have had issues, this link might help you out. http://www.ferrariaustralia.com/Technical/fuse_panel_repairs.htm and especially the PDF available for download at the end of page two.

Given my work on the Testarossa board I would like to repair a 400 board that I have which appears to only have one burnt track, but it's from a totally different pin to anything that fails on a Testa.

Here are two pictures of the 400 board.
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What I need to try and figure out is where the circled pin goes to.

The document that I created for the Testarossa shows the direction of travel for the current from the fuse to the relay and then to which pin on the white plugs. What I'm trying to understand in this instance is where does the circled pin connect to and what does it run.

Generally the white plugs carry power or earth direct to something in the car, be it a fan, pump, or air con clutch. If I knew where the wire at the circled pin goes to, then I'm sure that one of the 400 owners on here could tell me which relay runs that appliance, and then which fuse runs that curcuit.

Once I know that (for example) the fifteenth fuse from the left supplies power to the fuel pump and the fuel pump relay is the third one from the left on the top row, and then connected to pin 4 on the white plug (circled) is a red wirte that suplied power to the fuel pumps, then I can rebuild the curcut properly.

So could anybody shed some light for me. Maybe this is a common failure spot and you guys know which curcuit it feeds, which relay it runs from and which fuse protects that particular curcuit.

Any help greatly appreciated.

 

As an aside, do the 400 and 400i share the same fuse boards?

 

Interesting that the same pin has burnt, but also taken the one next to it.

It would be very uncommon for a negative to burn. The additional heat is generally caused because the appliance (pump, fan etc) has started to wear and is drawing too many amps. The connectors to the fuse board pins are not very good conductors, and when subjected to too many amps they heat up dramatically, causing damage to the boards. Hence I think that these two pins probably carry a current load to an appliance in the car.

If the appliance is replaced or repaired to bring it back to factory amp draw, then the boards are generally okay, but the connectors will always be a bit of an issue.