| Rocket11 | -- 08-23-2025 @ 4:57 PM |
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Hi I’m currently converting my 47 Mercury to 12v with a kit from Vintage Auto Garage. Can anyone tell me what these 2 components under the dash on the firewall are please? Wiring is confusing as prior owners have replaced some section of wiring /looms with different coloured wires so a lot of tracing is taking place. The.generator has been changed to a Power Gen alternator with a coil with an internal resistor. This is my first in-depth restoration so it’s a slow process for me but trying to do things on a budget. Thank you, Rod
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| zeke3 | -- 08-23-2025 @ 6:12 PM |
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The component on the left in your photo is the resistor for the ignition coil and the perforated square is the circuit breaker for the lighting system mainly. I am not sure if you need either of those when you convert to 12v. You will need circuit protection, such as a fuse block with individual fuses for each circuit in your conversion.
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| JayChicago | -- 08-23-2025 @ 6:44 PM |
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Disagree with the previous post. You do not need to add a fuse block. Most who have converted to 12 volt have not gone that far. Your existing circuit breakers will work just fine on 12 volt. Circuit breakers and fuses work on amps, do not care about voltage. And with 12 volts your lights will be drawing 1/2 the amps.
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| JayChicago | -- 08-23-2025 @ 7:20 PM |
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The resistor does not look wired correctly to me. You said you are using a coil with an internal resistor. Your photo shows the original resistor still in the circuit. The solid Red wire comes from the ignition switch to provide the power. The Red/Black wire goes to the coil. Right now electricity is going thru the resistor to get to the Red/Black wire, and the added modern wire. To by-pass the resistor, move the power (Red) wire over to the other terminal to feed the coil wire directly. Weather or not to leave the resistor in the circuit depends on the coil you are using. You must know the internal resistance of your coil. Put an ohm meter across the small terminals on the coil. For 12 volt, you need 3 ohm in the circuit. If your coil is 3 ohm by itself, by-pass the resistor. If your coil is less than 3 ohm, you need to add resistance by using the original resistor.
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