Bringing Power to Electrical, Testing Electrical System Prior to Engine Installation |
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Bringing Power to Electrical, Testing Electrical System Prior to Engine Installation |
Highland |
Oct 18 2019, 05:08 PM
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#1
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Senior Member Group: Members Posts: 513 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California |
If I connect the 12V battery (+) to the 2 red wires from the main wiring harness and the battery (-) to the chassis ground, will the electrical system power up when the ignition key is in the ON position?
The main harness is plugged into the relay board. Neither the alternator, ignition or injection harness are plugged into the relay board, but all the round relays are in place. By electrical system I'm referring primarily to windshield wipers, headlights, and lights. I want to make sure they work before installing the fuel tank and engine. |
lierofox |
Oct 18 2019, 10:29 PM
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#2
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Member Group: Members Posts: 256 Joined: 23-June 15 From: Paso Robles, CA Member No.: 18,880 Region Association: Southern California |
Looking over the wiring diagrams that I have, of the battery + wires:
1 super thick cable goes directly to the starter motor. 2 of them go directly to the relay board to supply power for the fuel pump, heater blower, and rear defroster relays. The important ones for what you're testing: 1 goes to the fuse box under the dashboard to fuses 10, 11, and 12. According to the '72 diagram, that same wire goes to the ignition switch as well. According to the '73 wiring diagram, they used an additional 5th wire that goes to the ignition/key switch instead. |
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