I know this must have been discussed before but I have searched and cant find anything. I have a 94 Velle and my windscreen wipers only work on a very slow intermittent setting and nothing else. If I spray with the wash wipe they then wipe on a constant speed for a few wipes. I really need a normal constant and a fast constant setting? I have bought a number 19 relay after advice on the forum but not sure which slot that needs to go in and if this will provide the extra settings?