Step 1: Modifying the Engine Stand Frame

• Cross-Bracing & Supports: We welded up custom steel brackets and ran cross-bracing using bolts and self-tapping screws. Upward steel tubing with triangular gussets adds rigidity to prevent frame flex when the engine torques over.
  
  

• Battery Tray: We welded a steel grate across the lower frame, giving the heavy 12V battery a secure, flat resting spot near the starter.
  
  

• Radiator Slots: The frame uprights include slotted channels to mount a radiator and shroud for extended test runs.
  
  

• Gauge & Switch Mount: Angled steel tabs welded near the top allow a custom wooden or metal control panel to sit at eye level.
  
  

Step 2: Essential 12V Electrical Components

• Battery Master Disconnect Switch: Cuts all power to the stand instantly in an emergency.
  
  

• Ignition Switch Panel: Controls main 12V power toggles and features a push-button start.
  
  

• 12V Fuse Box / Breaker Block: Distributes fused power to individual accessory switches.
  
  

• In-Line Fuse Holder: Placed between the battery circuit and control panel for added safety.
  
  

• 12V Micro Electric Fuel Pump: Supplies steady fuel pressure from a temporary gas can directly to the carburetor.
  
  

Step 3: Step-by-Step Wiring Sequence

Starter Power & Disconnect: Run your heavy-gauge positive battery cable directly to the main starter solenoid post. From the starter post, run a hot feed up to the Battery Master Disconnect Switch, placing an in-line fuse along this feed.

Fuse Box & Toggle Panel: Connect the output side of the Master Disconnect directly to your 12V Fuse Box. From the fuse box, run dedicated hot leads to the bottom terminals of your control panel toggle switches.

Ignition & Push-Button Starter: Wire the main ON/OFF toggle switch to a terminal junction. Split this feed so it supplies 12V switched power to your HEI distributor (or ignition coil) and to one side of the momentary push-start button. Run the output of the push-button through a relay directly to the starter solenoid S-terminal. The video below shows this part a lot easier than me trying to add pictures.

Pro-Tip on Cooling Accessories: If you add an electric radiator fan or electric water pump later, route their power through temperature-activated relays so they engage automatically as the engine warms up.

Parts & Tools Used in This Build

• Battery Master Disconnect Switch: https://amzn.to/3BJQWIl
  
  
• Ignition Switch Panel & Push Start: https://amzn.to/3WriOJ5
  
  
• 12V Fuse Box Block: https://amzn.to/3BLGY9m
  
  
• In-Line Fuse Holder: https://amzn.to/3YzmXwE
  
  
• 12V Micro Electric Fuel Pump: https://amzn.to/3Gc8DTH
  
  
• Primary Automotive Wire: https://amzn.to/3PDRLYX
  
  
• Crimping Tool & Wire Terminals: https://amzn.to/3YyRYR9
  
  

Key Takeaways for DIY Fabricators

1. Fuses Are Non-Negotiable: Never bypass fuses or circuit breakers on a temporary test stand. Loose wires around a vibrating engine can easily short against the frame.
   
   
2. Grounding is Everything: A bad block ground will lead to slow cranking, weak spark, or hot starter wires. Verify your block-to-battery connection before trying to fire the engine.
   
   
3. Keep Your Workstation Clean: Secure loose wiring harnesses with zip ties and keep fuel lines routed far away from open headers and rotating flywheels.
   
   

Watch the Full Video Guide

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