Jnkgrce

My wifes van had its tail & dash lights go out all the sudden i check all connections & wires but the #10 fuae continues to blow out no matter what ive tried I check all wiring for radio & under dash both cig lighters . I read its a bad ground somewhere but where should I look 1st . I know there is alot of possible ground wires. Any & all comments would be helpful as she can only drive in daylight thx