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No they are not tripping as soon as they are turned on, it takes a while and must be on high beam, sorry if I flubbed that up.
It is possible the breaker in his switch is just weak.
Since it is obviously a serious short (breaker tripping as soon as the lights are turned on) substituting the light switch would seem to be a logical step.
I would look at the back of those headlights and see if they are 12V if he re-wired the headlights for 12V that is your problem, the 12V lights pull around twice the amps as the 24V ones which would overload the breaker.
There is a circuit breaker in the light switch, you must be overloading the breaker or it is weak.
Have the headlights been replaced, or was it in civilian hands before you bought it?