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Hey guys, I'm wiring up my two Aeromotive 255's and a Davies Craig intercooler pump to may LSA swapped 96 Impala. I have three pre-made relay harnesses that are very nice but I hate the mess of mounting individual relays and having multiple power wires coming out everywhere.
Because I may want to add two more relays for heated seats, I figured it would be nice to just add a bussed relay box that is powered by one power lug like factory under hood fuse/relay box.
I looked into aftermarket ones like the Eaton Bussman series and they are pricey. I don't mind paying, but I actually have two spare engine harnesses from 96 Impalas and they have bussed relay/fuse boxes with them.
Do you guys see any problem with cutting one of those out and wiring up my relays into it? I figure I would wire the two fuel pumps into the old fan relay and the davies craig pump into the old fuel pump relay and I should have a few extra spaces for other relays and fuses. I can mount it near the alternator and power it with a 2 gauge wire direct from the alternator. The fuel pumps have a 20amp max draw so I would THINK that wouldn't be more than the factory electric fans on the B body, and the intercooler pump is only 10amp max draw so the factory fuel pump relay should work for that (??). I could just solder the wiring to the existing ones so I don't even need to re-pin anything.
Is there any reason this is a bad idea, or anyone have a better/easier solution?
In my swaps I have found that ford fuse/relay boxes are the easiest to integrate into the cars existing wiring circuits since they have removable pins on the backside. It makes it easy to trace where the wires go and also to make changes to wire size or pinouts. Most of the gm boxes seem to just have factory plugs on the backside so not as easy to make changes imo. I found this on a 02 lincoln ls. It has 7 relay slots and large fuses for the main power wires and lots of slots for mini fuses. It has a removable cover on the backside so easy access to wiring. The older crown vics have a smaller square box that have 4 relay slots & lots of maxi fuse slots and a few standard fuse slots.
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Adding a factory bussed relay box? 
