I know napa sells an adjustable timer has a knob for adjustment it will take a lot of amps. But I cant remember part number. Had them in dump box vibrate circuits so you didn't knock out lights. powered a relay
don't get in a hurry. Shop around. There are quite a few around but.. Some are way high on prices. You may want to find one before season starts though.
OK. So we been in the cold for a while. Lets see how far you have tore your bike down. who has the biggest pile of parts.. Are we going to make spring season finish. don't have a better pic. lets see yours