Understanding the Issue
* No Power to the Dash: This is the main issue and tells you there's a problem with your power supply (battery) or the wiring to your dash.
* New Engine: This means the wiring is probably new or reconnected, so mistakes are possible.
* Unknown Engine State: You don't know if the engine has spark or if it's getting fuel. This makes things a bit more complicated.
Troubleshooting Steps
1. Battery Check:
* Battery Terminal Connections: Ensure the battery terminals are clean and tightly connected. Use a battery terminal brush to clean any corrosion.
* Battery Voltage: Use a voltmeter to check the battery voltage. It should be around 12.6 volts when fully charged. If it's significantly lower, you might have a dead battery.
2. Check Main Power Feed:
* Battery to Starter: Trace the main power cable (usually a heavy red cable) from the battery positive (+) terminal to the starter solenoid. Make sure it's connected securely.
* Starter Solenoid to Engine: Trace the wire from the starter solenoid to the starter motor. Make sure it's connected securely.
* Starter Solenoid to Ignition Switch: Check the wire going from the starter solenoid to the ignition switch. This wire is usually red and might have a fuse inline.
3. Check Ignition Switch:
* Continuity: Use a multimeter to check the continuity of the ignition switch itself. Turn the key to the "on" position and see if you have continuity between the terminals.
* Connections: Inspect the connections at the ignition switch and make sure they are secure and clean.
4. Check Fuses:
* Fuse Box: Locate the fuse box and inspect all the fuses for any blown ones. Replace any blown fuses.
* Instrument Panel Fuses: Check for fuses specifically related to the instrument panel or dash.
5. Check Wiring Harness:
* Visual Inspection: Carefully examine the entire wiring harness for any broken, frayed, or loose wires.
* Continuity Test: If you find a suspicious wire, use a multimeter to check for continuity. You should have a continuous path from the battery to the dash.
6. Check the HEI Distributor:
* Distributor Cap: Inspect the distributor cap for any cracks, wear, or moisture. Make sure the rotor is making good contact with the cap.
* Distributor Connections: Ensure all wiring to the distributor, including the HEI module, is properly connected.
7. Check the Alternator:
* Connections: Make sure the alternator is connected properly to the battery and the engine.
* Charging: With the engine running, check the alternator output voltage. It should be around 13.5-14.5 volts.
Important Considerations
* Wiring Diagram: Having a wiring diagram for your specific vehicle is essential. It will show you the correct wiring pathways and connections.
* Professional Help: If you're not comfortable working with electrical systems, it's best to seek help from a qualified mechanic. Electrical issues can be dangerous and require specialized knowledge.
Remember: Safety first! Disconnect the battery before working on any electrical system. Let me know if you have a specific wiring diagram, and I can help you more precisely.
