Can I add,... circuit's to fuse block ?

[FUNFER2]

This question is really putting the cart before the horse, and I need to see what space is available, with my painless fuse box but,.....I want to know ahead of time.

Would I have to buy a new harness, box and start all over ,
or is there a way of adding/pig tailing a second box, that is meant just for this predicament,..... not some shade tree mechanic way ?

[Tommy]

I hope I understand your question correctly. Assuming I do, here's my answer.

Each circuit (e.g., electric fan) has at least five elements. It starts at the power source (e.g., positive terminal of battery), includes an on/off switch, a fuse or circuit breaker, the device being powered, and ends at the ground (e.g., negative terminal of battery). A fuse block is just a convenient way to group the fuses for several circuits in one location. If you want to add more circuits, you can add another fuse block and put it near the first one if there is room to mount it. The circuits of the second fuse block will need to be connected to a power source and ground plus the other elements mentioned earlier. If the wire(s) carrying power to the first fuse block are adequate, you could run a pigtail to the second fuse block to power its circuits. To know if that is safe to do, you'll need to know how much power each circuit will carry and how much capacity each was designed to carry. If running a pigtail is not possible, you can just run power to the second fuse block like you did the first one.

[FUNFER2]

Great information Tommy !

I've never learned electronics, therefore I'm afraid of it. So much can go wrong with electronics, and that can get very expensive.

Thank you much,
Kev

[Ronbo]

Some stuff you don't really want on fuses. If you look at an everyday production vehicle the primary feeds are protected by self-resetting breakers.

Case in point would be the engine ignition system or the lighting. The light switch power feed will be protected by a 30A breaker the individual outputs will then be fused (5A for dash lights, 10~15A fuse for running/brake lights, NO FUSE for headlights). The stock Cobra electrical system sucks, but that's to be expected from any British car.

Add to that Ford having the worst electrical systems of the US mfgs. and well, there you go...

Ignition, Fans, Charging circuit, and Headlights should only be on breakers. The fuel pump is about the only "critical" circuit I'd consider running a fuse on.