How to find the source of electical problem in 1986 Jeep Cherokee?

Debo

New member
1986 Jeep Cherokee with the v-6, I think its the headlight switch because the lights and all quit working after you start the vehicle, and then no lights work except the brake lights, any help?
Thanks.
i thought it might be the headlight switch, anyway to test it before just replacing it?
 
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