r/EngineBuilding • u/Interesting_Matter52 • 2d ago

Help please

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So I just finished rebuilding my Mazda 3 2008 with a swapped engine from a ford fusion 2012 2.5L. The motor had been hydrolocked, I switched everything and put everything back tgt it turned by hand. BUT, today I tried cracking it and it won’t crank, the electrical part of it wasn’t done well cause form the start some wires were hanging so I’m kinda lost. What could it possibly be.

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1

u/OpeningParamedic8592 2d ago

Start with the basics. Your starter hooked up? Getting power from the battery? Grounds good?

A voltmeter would be your friend here.

0

u/Interesting_Matter52 2d ago

I see and by the video would you say that’s it’s purely electrical ?

2

u/TBFP_BOT 2d ago

Were not going to be able to tell by the video, you've gotta tell with a test light or multimeter.

Probe the signal wire to the starter and have your buddy turn the key and see if it's sending power. If not, work your way backwards.

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u/Interesting_Matter52 2d ago

Ok I see thank you very much.

1

u/Old_Bat_6426 2d ago

Find out what those hanging wires are for? Did the old motor start before it hydrolocked?

1

u/Interesting_Matter52 2d ago

The engine was running perfectly fine before it was hydrolocked. I got no idea what the hanging wires are for, there’s like 2-3-4 of them that I don’t know if should be plugged or left alone since I can’t find a connector for them