Fourtrac will not start

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My fourtrac 2.8 diesel was running fair today I changed a rusty core plug and went to start it and it would not start it turns over ok my mate came round and gave me a tow and when I tried to start it the all the dash lights went out but the headlights where still on has anyone any idea where I should start

I'd start off by checking the

I'd start off by checking the earths on the engine & battery. Did you remove / disturb an earth strap when doing the core plug?

1985 Veg oil burning Fourtrak "Rocky".