diff --git a/docs/wiring.md b/docs/wiring.md
index 6d2535c..2d888dd 100644
--- a/docs/wiring.md
+++ b/docs/wiring.md
@@ -1,63 +1,451 @@
-# Wiring Overview
+# Wiring
 
-## House Battery Power Distribution
+This document describes the current planned wiring for the Overland Controller install.
 
-House Battery Positive
-├── 5A Fuse → ESP32 Controller
-├── 3A Fuse → 12V→5V Buck Converter
-├── 30A Fuse → Fridge Relay
-└── 30A Fuse → Starlink Relay
+The current system uses:
 
-House Battery Negative
-├── ESP32 Ground
-├── Buck Converter Ground
-├── Relay Grounds
-└── Sensor Grounds
+- ESP32 2-relay controller board
+- Raspberry Pi Pico 2 W dashboard
+- CAT5/CAT6 cable between rear controller and dash
+- 12V-to-5V buck converter in the dash enclosure
+- DS18B20 temperature sensors
+- JBD/Xiaoxiang BMS over BLE
+- External automotive relays for high-current loads
 
-## Dashboard Power
+---
 
-12V House Battery
-↓
-Buck Converter (5V)
-↓
-CAT5 Cable
-↓
-Pico Dashboard
+## Current ESP32 Relay Board
 
-## Communications
+Board markings:
 
-Pico
-↓
-UART over CAT5
-↓
-ESP32
+    ESP32_Relay_X2
 
-Backup:
-WiFi
+Relay contact terminals:
 
-## Relay Control
+    NO1  COM1  NC1  NO2  COM2  NC2
 
-ESP32 Relay Output
-↓
-Bosch Relay Coil
+Power terminal:
 
-Bosch Relay Contacts
-↓
-Fridge / Starlink / Future Loads
+    VCC  GND  5V
 
-No high-current loads pass through the ESP32 relay board.
+UART/programming header:
 
-## Temperature Sensors
+    IO0  GND  GND  RX  TX  5V
 
-Single DS18B20 Bus
+Firmware relay mapping:
 
-Sensors:
-- Fridge Zone 1
-- Fridge Zone 2
-- Rear Seat Area
-- Outside Air
+    relay_1 = GPIO16
+    relay_2 = GPIO17
 
-Future:
-- Battery Compartment
-- Cabin Air
-- Water Tank
+---
+
+## System Power Overview
+
+Plain text diagram:
+
+    House Battery +
+          |
+          +---- Main fuse / distribution
+          |
+          +---- 2A fuse --------------------> ESP32 relay board VCC
+          |
+          +---- 1A or 2A fuse --------------> CAT5 blue pair to dash +12V
+          |
+          +---- Load fuse ------------------> Automotive relay #1 pin 30
+          |
+          +---- Load fuse ------------------> Automotive relay #2 pin 30
+
+    House Battery -
+          |
+          +---------------------------------> Common ground bus
+                                               |
+                                               +--> ESP32 relay board GND
+                                               +--> CAT5 green pair to dash GND
+                                               +--> Automotive relay coil grounds
+                                               +--> Load grounds
+
+Notes:
+
+- Fuse every positive feed.
+- Keep all grounds common.
+- Do not run high-current loads directly through the ESP32 relay board.
+- Use the ESP32 relay board to trigger automotive relays.
+
+---
+
+## ESP32 Board Power
+
+Use the bottom-right power terminal:
+
+    VCC  GND  5V
+
+Recommended wiring:
+
+    House battery +
+          |
+          +-- 2A fuse
+          |
+          +---> ESP32 VCC
+
+    House battery -
+          |
+          +---> ESP32 GND
+
+Leave the ESP32 board 5V terminal unused unless verified for your exact board/power setup.
+
+---
+
+## Pico Dashboard Power Over CAT5
+
+The dash Pico should be powered from a buck converter inside the dash enclosure.
+
+Rear compartment:
+
+    House battery +
+          |
+          +-- 1A or 2A fuse
+          |
+          +---> CAT5 blue/white + blue conductors
+
+    House battery -
+          |
+          +---> CAT5 green/white + green conductors
+
+Dash enclosure:
+
+    CAT5 blue pair +12V
+          |
+          +---> Buck converter IN+
+
+    CAT5 green pair GND
+          |
+          +---> Buck converter IN-
+
+    Buck converter OUT+ 5V
+          |
+          +---> Pico VSYS
+
+    Buck converter OUT- GND
+          |
+          +---> Pico GND
+
+Important:
+
+- Do not connect 5V to Pico 3V3.
+- Use Pico VSYS for 5V input.
+- Keep ESP32 GND and Pico GND connected through the CAT5 ground pair.
+
+---
+
+## CAT5 / CAT6 Cable Plan
+
+Recommended CAT5/CAT6 wiring between the rear ESP32 controller and dash Pico:
+
+    Orange/White  ESP32 TX  ---> Pico GP1 RX
+    Orange        ESP32 RX  <--- Pico GP0 TX
+
+    Green/White   Ground
+    Green         Ground
+
+    Blue/White    +12V fused dash feed
+    Blue          +12V fused dash feed
+
+    Brown/White   Spare
+    Brown         Spare
+
+Notes:
+
+- Use two conductors for +12V.
+- Use two conductors for ground.
+- UART requires shared ground.
+- Brown pair is reserved for future expansion.
+
+---
+
+## Pico 2 W UART Pins
+
+Recommended Pico UART pins:
+
+    Pico GP0 = UART0 TX
+    Pico GP1 = UART0 RX
+
+Connection:
+
+    ESP32 TX  ---> Pico GP1 RX
+    ESP32 RX  <--- Pico GP0 TX
+    ESP32 GND ---> Pico GND
+
+Do not connect ESP32 5V to Pico unless intentionally using it as a power source.
+
+Current plan is to power Pico from local dash buck converter instead.
+
+---
+
+## ESP32 UART Header
+
+The ESP32 relay board exposes a 6-pin header:
+
+    IO0  GND  GND  RX  TX  5V
+
+Use:
+
+    TX  ---> Pico GP1 RX
+    RX  <--- Pico GP0 TX
+    GND ---> Pico GND
+
+Do not use IO0 for dashboard wiring.
+
+Do not use 5V for dashboard power in the current design.
+
+---
+
+## DS18B20 Temperature Sensor Bus
+
+Recommended ESP32 GPIO:
+
+    GPIO4
+
+All DS18B20 sensors share one 1-Wire data bus.
+
+Plain text diagram:
+
+    ESP32 3.3V
+        |
+        +---- 4.7k pull-up resistor
+        |
+    ESP32 GPIO4 --------------------+---- DS18B20 Sensor 1 data
+                                    |
+                                    +---- DS18B20 Sensor 2 data
+                                    |
+                                    +---- DS18B20 Sensor 3 data
+                                    |
+                                    +---- DS18B20 Sensor 4 data
+                                    |
+                                    +---- Additional sensors up to temp_8
+
+    ESP32 3.3V -------------------------- DS18B20 red wires
+    ESP32 GND  -------------------------- DS18B20 black wires
+    ESP32 GPIO4 ------------------------- DS18B20 data wires
+
+Typical waterproof DS18B20 wiring:
+
+    Red    = 3.3V
+    Black  = GND
+    Yellow = Data
+
+Important:
+
+- A 4.7k resistor is required between 3.3V and data.
+- One pull-up resistor is used for the whole bus.
+- Do not use one resistor per sensor.
+- Long leads may need clean splices and good grounding.
+
+---
+
+## BMS Connection
+
+The JBD/Xiaoxiang BMS is wireless.
+
+Connection:
+
+    ESP32  <---- BLE ---->  JBD/Xiaoxiang BMS
+
+No physical BMS data wiring is currently required.
+
+The BMS Bluetooth address is stored in controller configuration.
+
+---
+
+## Relay Control Strategy
+
+The onboard ESP32 relays should trigger automotive relays.
+
+They should not directly power large vehicle loads.
+
+Recommended pattern:
+
+    ESP32 onboard relay
+          |
+          +-- switches automotive relay coil
+                    |
+                    +-- automotive relay switches load power
+
+This keeps high current off the ESP32 board.
+
+---
+
+## Relay 1 Automotive Relay Wiring
+
+Example installation-specific name:
+
+    relay_1 = Starlink
+
+ESP32 board contact terminals:
+
+    COM1
+    NO1
+
+Automotive relay wiring:
+
+    House battery +
+          |
+          +-- load fuse
+          |
+          +---> Automotive relay pin 30
+
+    Automotive relay pin 87
+          |
+          +---> Load positive
+
+    Load negative
+          |
+          +---> Ground bus
+
+    Automotive relay pin 85
+          |
+          +---> Ground bus
+
+    Automotive relay pin 86
+          |
+          +---> Switched positive from ESP32 relay COM1/NO1 circuit
+
+ESP32 relay contact wiring concept:
+
+    Fused low-current +12V
+          |
+          +---> ESP32 relay COM1
+
+    ESP32 relay NO1
+          |
+          +---> Automotive relay pin 86
+
+When relay_1 turns on, COM1 connects to NO1 and energizes the automotive relay coil.
+
+---
+
+## Relay 2 Automotive Relay Wiring
+
+Example installation-specific name:
+
+    relay_2 = Fridge
+
+ESP32 board contact terminals:
+
+    COM2
+    NO2
+
+Automotive relay wiring:
+
+    House battery +
+          |
+          +-- load fuse
+          |
+          +---> Automotive relay pin 30
+
+    Automotive relay pin 87
+          |
+          +---> Load positive
+
+    Load negative
+          |
+          +---> Ground bus
+
+    Automotive relay pin 85
+          |
+          +---> Ground bus
+
+    Automotive relay pin 86
+          |
+          +---> Switched positive from ESP32 relay COM2/NO2 circuit
+
+ESP32 relay contact wiring concept:
+
+    Fused low-current +12V
+          |
+          +---> ESP32 relay COM2
+
+    ESP32 relay NO2
+          |
+          +---> Automotive relay pin 86
+
+When relay_2 turns on, COM2 connects to NO2 and energizes the automotive relay coil.
+
+---
+
+## Automotive Relay Pin Reference
+
+Common Bosch-style relay pins:
+
+    30 = Common load power input
+    87 = Normally open load output
+    87a = Normally closed output, if present
+    85 = Coil side
+    86 = Coil side
+
+Recommended use:
+
+    30  = fused battery positive
+    87  = load positive
+    85  = ground
+    86  = switched positive from ESP32 relay board
+
+---
+
+## Future Reserved Inputs
+
+Do not wire these yet unless firmware support has been added.
+
+Recommended reservations:
+
+    GPIO34 = Ignition sense input
+    GPIO35 = House battery voltage sense input
+
+Reason:
+
+- GPIO34 and GPIO35 are input-only.
+- Input-only pins are appropriate for sensing.
+- They are not appropriate for relay outputs.
+
+Important:
+
+Never connect vehicle 12V directly to an ESP32 GPIO.
+
+Use a voltage divider or proper interface circuit.
+
+---
+
+## Current Version 1 Wiring Summary
+
+Current required physical wiring:
+
+    ESP32 board VCC/GND from fused house battery power
+
+    ESP32 TX/RX/GND to Pico over CAT5
+
+    12V fused dash feed and ground to Pico dash enclosure over CAT5
+
+    Dash buck converter 12V to 5V
+
+    Buck 5V to Pico VSYS
+
+    ESP32 GPIO4 to DS18B20 1-Wire bus
+
+    4.7k pull-up from GPIO4 data bus to 3.3V
+
+    ESP32 relay COM/NO contacts to automotive relay coils
+
+    Automotive relays to actual high-current loads
+
+    ESP32 BLE to JBD/Xiaoxiang BMS
+
+---
+
+## Safety Notes
+
+- Fuse every positive feed.
+- Use proper wire gauge for each load.
+- Keep high-current wiring separate from signal wiring where possible.
+- Use common ground between ESP32, Pico, buck converter, relays, sensors, and battery.
+- Do not connect 12V directly to any ESP32 or Pico GPIO.
+- Do not power high-current loads directly through the ESP32 relay board.
+- Test relay behavior with a multimeter before connecting expensive loads.