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. ![Laughing2 :lmao: :lmao:](https://data.irate4x4.com/assets/smilies/laughing2.gif)
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.![Thefinger :flipoff2: :flipoff2:](https://data.irate4x4.com/assets/smilies/thefinger.gif)
Working on wiring the LS (GEN IV) in my FJ80. Should probably make a thread for it
![Homersimpson :homer: :homer:](https://data.irate4x4.com/assets/smilies/homersimpson.gif)
![Laughing2 :lmao: :lmao:](https://data.irate4x4.com/assets/smilies/laughing2.gif)
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:
![currentperformance.com](/proxy.php?image=https%3A%2F%2Fcurrentperformance.com%2Fwp-content%2Fuploads%2F2023%2F05%2Fs-l1600-1.jpg&hash=44cccd128c20390938e334930886e5c7&return_error=1)
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](/proxy.php?image=https%3A%2F%2Fcurrentperformance.com%2Fwp-content%2Fuploads%2F2019%2F11%2Fcropped-Keep_Curr-32x32.png&hash=cb2d7478878ab909d526cedca0cace2c&return_error=1)
![www.michiganmotorsports.com](/proxy.php?image=https%3A%2F%2Fcdn11.bigcommerce.com%2Fs-o2f19l6bte%2Fproducts%2F1057%2Fimages%2F5777%2Fapiwrlvfu__79500.1637856076.500.750.jpg%3Fc%3D2&hash=cb668c86c9eb923cdaac89e910da81d9&return_error=1)
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](/proxy.php?image=https%3A%2F%2Fcdn11.bigcommerce.com%2Fs-o2f19l6bte%2Fproduct_images%2FFavicon%2520Preview.png%3Ft%3D1702654215&hash=e77d7571ddfc454a12f926aef9bc0e8c&return_error=1)
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.
![Thefinger :flipoff2: :flipoff2:](https://data.irate4x4.com/assets/smilies/thefinger.gif)