Starter Issues - 68 Stang EFI conversion

Hey all!

I’ve read some posts about this issue but not quite like what I’ve encountered. I have a 68’ mustang. EFI conversion with original block and 93 stang motor 302. She has run great but recently she wouldn’t start. Got the solenoid clucking sound so charged battery. Had trouble starting but started up. Took down the road and back to run it some. Let it run to charge battery. Turned off to test battery and all it would do is turn over til I see smoke and heat from hood. I did not do conversion but I have two starter solenoids. They are in series and the first one hat stater hot wire. That wire was so hot it was melting at solenoid and solenoid was super hot as well. The main power from battery also super hot. Replaced solenoid. Started up twice but then all I get is a high whining from the starter not engaging. I charged battery again and still no luck. I hear the solenoid doing it part and even bypassed the first one and then both and got the whine. Also cleaned grounds by engine block. Also took stater and battery to auto parts store. Both tested good. I need some serious guidance. The battery is in the trunk and the wiring is not easy to follow as it was a homemade one by previous owner. Need a way to test of understand hats going on!
Thanks
68StangEFI

General karthief said:

Most trunk mounted batteries are done with inadequate cable size and not good ground locations, there are several companies that make cable kits like american auto wire. I would not mess with wiring of unknown quality/size, the two solenoid deal is a red flag for me. I would get a kit and start over then you know whats been done and it was done correctly.

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What other good wiring kits would you recommend? Since it is EFI, will the kits be 100% replacement or would there be a need for more than one for the original wiring? Not very good with ELECTRICAL.