I just installed a cigarette lighter & it's shorting out & blowing the 20 amp fuse. I hook power to the center post & attach ground to the stud on the outer case.It looks so simple.... What am I doing wrong?

~Denny
1953 Chevy 3100
w/1960 261 cid, 848 head | Weber 32/36 progressive 2 barrel carb. | Three on the tree & 3:55 torque tube | 12 V w/Gener-Nator & 6 V starter
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1998 Chevy Suburban 350 ci awd/4wd