Fuse threads are a good indicator.
Only two choices. Try it each way and determine for yourself. If "directional" the difference should be apparent. Otherwise maybe not or defective. It ain't rocket science.
Switch directions several times to be sure. Sometimes merely removing and replacing an electrical device alone results in better contact and performance.
Only two choices. Try it each way and determine for yourself. If "directional" the difference should be apparent. Otherwise maybe not or defective. It ain't rocket science.
Switch directions several times to be sure. Sometimes merely removing and replacing an electrical device alone results in better contact and performance.