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The stock wiring to the coil through the ignition switch will cause a voltage drop (due to series resistance and inductance). If you wanted to improve things a bit you can use the original coil +12v lead to switch a relay, and connect the relay contacts with a heavier gauge wire directly to the battery and the coil (fuse recommended). On my V8 conversion I found the stock wiring and relay board too wimpy to power ignition and my pump and cooling fans. I replaced it all with two new 40A relays energized by the ignition switch. What a difference that made getting nearly a full +12V to the ignition and cooling system.
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