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In '65-'66, Ford used firewall bulkhead connectors to get power to and from the engine compartment. The bulkhead connector behind the engine handles the engine's senders and ignition power. The bulkhead connector near the master cylinder carries power from the battery to the electrical system, plus power to the headlights, parking lights, and horns. Beginning in '67, Ford moved these vulnerable connections under the dashboard to protect them from the elements.