Using a #5224 Combination two switches to light two different fixtures (an exterior light) and it will only turn off and on by 2nd switch being switched on or off (the interior ceiling light) Hooked each brass contacts with with lines and have only one line left. I switch the from top and bottom on black screw side but still need to have interior light on to light exterior light. Whatsup? Back of switch unit has black screws saying "common" and brass "B1 & A1."

You need to test your wires using ordinary tester. Separate wires, turn on power. Do not untwist wires that are twisted together. Test each wire to bare ground wire. Tester lights up on hot wire. Hot wire goes to dark screw. Test some more. Test hot wire to other wires, including white wires that are twisted together .. test hot to all wires except bare ground. Tester lights up on neutral. Connect neutral to silver screw. If you do not have a neutral, then you do not have the wires needed for a receptacle. Assume that you have one wire left, that does not light up when testing, this should be the wire going to load (lights) ... this wire connects to brass screw. You need to test your wires using ordinary tester. Separate wires, turn on power. Do not untwist wires that are twisted together. Test each wire to bare ground wire. Tester lights up on hot wire. Hot wire goes to dark screw. Test some more. Test hot wire to other wires, including white wires that are twisted together .. test hot to all wires except bare ground. Tester lights up on neutral. Connect neutral to silver screw. If you do not have a neutral, then you do not have the wires needed for a receptacle. Assume that you have one wire left, that does not light up when testing, this should be the wire going to load (lights) ... this wire connects to brass screw.

BEWARE that the Leviton box instructions are misleading to a dangerous degree; they use the SAME box instructions for ALL their devices - including switched outlets. A box containing two single-pole switches has NO BUSINESS having instructions saying not to use it to replace switches that use 2 wires, or to wire in a neutral (!!) - because some of their OTHER products are Outlet combination devices. Only if your reading is careful or you are experienced, do you avoid a dangerous mistake. Incredible what Leviton did to save a penny... BEWARE that the Leviton box instructions are misleading to a dangerous degree; they use the SAME box instructions for ALL their devices - including switched outlets. A box containing two single-pole switches has NO BUSINESS having instructions saying not to use it to replace switches that use 2 wires, or to wire in a neutral (!!) - because some of their OTHER products are Outlet combination devices. Only if your reading is careful or you are experienced, do you avoid a dangerous mistake. Incredible what Leviton did to save a penny...