Question for the brain trust.
Working on wiring the LS (GEN IV) in my FJ80. Should probably make a thread for it
but.... How conservative are the OE ratings for the wiring systems on an LS engine? The reason I ask is because I need to find a power distribution block / fuse block to power the new drivetrain. When looking for DIY/pre-wired solutions there is not a whole lot that gives me the warm and fuzzies in the price point I want to pay. 
When viewing the factory wiring diagram there are ~4 different circuit types to run the Engine and Trans.
1. B+
2. Run/Crank Relay
3. Powertrain Relay
4. Fuel Pump Relay
Looking at the interwebs that is not amazon there are:
currentperformance.com
www.michiganmotorsports.com
2 relays and 6 fuses which are rated below the factory diagram.
So I am leaning towards wiring a Bussmann RTMR to get the adequate number of relays / fuses with the correct ratings. Maybe I am overthinking this (like always) but would like some input from smarter people than me, or at least from people that haven't burned an LS swap to the ground.
Working on wiring the LS (GEN IV) in my FJ80. Should probably make a thread for it
but.... How conservative are the OE ratings for the wiring systems on an LS engine? The reason I ask is because I need to find a power distribution block / fuse block to power the new drivetrain. When looking for DIY/pre-wired solutions there is not a whole lot that gives me the warm and fuzzies in the price point I want to pay. When viewing the factory wiring diagram there are ~4 different circuit types to run the Engine and Trans.
1. B+
feeds these fuses:
- TCM BATT + (10A)
- ECM BATT + (10A)
2. Run/Crank Relay
feeds these fuses:
- Trans IG1 (15A)
- ECM IGN (15A)
3. Powertrain Relay
feeds these fuses:
- Eng (15A)
- O2-A (10A)
- O2-B (10A)
- Inj A (20A)
- Inj B (20A)
- ECM throttle (15A)
4. Fuel Pump Relay
feeds this fuse:
- Fuel Pump (20A)
Looking at the interwebs that is not amazon there are:
LSx Swap Sealed Fuse Block & Relays
This is our small fuse/relay module that is used on bare bones Stand-alone Wiring harnesses that simply need to make an engine run. Buy yours here.
currentperformance.com
LS Swap Wire Harness Fuse Block Stand alone Wiring Harness OBD2 Port Connector
Michigan Motorsports specializes in LS1 performance Parts, LS3 Rocker Arm Trunions, Electrial harnesses and adapters, and Diesel Parts
www.michiganmotorsports.com
2 relays and 6 fuses which are rated below the factory diagram.
So I am leaning towards wiring a Bussmann RTMR to get the adequate number of relays / fuses with the correct ratings. Maybe I am overthinking this (like always) but would like some input from smarter people than me, or at least from people that haven't burned an LS swap to the ground.
