Negative Trigger Fused Relay Panel

Hi all,

I’m redoing the wiring on my buggy’s relay panel after discovering that the previous setup was questionable (a fan motor even burned out). I'm hoping to get some advice on proper wiring and power distribution.

Current Setup (Being Removed):

There are 4 relays (all 4-pin) using negative trigger:

1. Fans

2. Engine (injectors & coils)

3. ECU

4. Fuel pump

- Pin 86 on all relays is tied together and connected to a 10A fuse powered by IGN switch (key-on)

- Pin 30 on all relays is tied together and goes to a constant 12V power post

- Pin 85:

Fuel and fan relays are triggered by Haltech 2500 (negative switch)

Engine and ECU relays are grounded directly to the engine block

- Pin 87 powers each respective accessory (fans, fuel, ECU, engine)

New Planned Setup:

Fused relay panel with five 4-pin relays, still using negative triggers:

1. 1 for each fan (2 total)

2. Fuel pump

3. ECU

4. Engine power (injectors & coils)

Wiring Plan:

- Pins 86 & 30 on each relay will be tied together and powered through individual fuses from a new fuse panel, which I want to power only when the key is on (IGN switch)

- Pin 85 will be used for negative triggers

- Pin 87 goes to each accessory as usual

My Question / Concern:

There is already an existing fuse block powered by IGN-on that handles other accessories (lights, brakes, steering, etc.)

I’m not sure if I can safely run a second fuse block off the same IGN-on circuit.

I’ve been researching, and it seems that I need a master relay (around 200A) that is triggered by IGN-on. This master relay would then power the new fused relay panel.

Is this the correct and safe way to do it?

I was also considering tapping into the main power (before the relay panel) through a 100A circuit breaker, but I’m unsure if that’s the best or cleanest solution.

Any feedback, advice, or wiring suggestions would be greatly appreciated!

Thanks in advance.