1978 Ski-Doo Shop Manual, Page 314Get this manual
SECTION 05 SUB-SECTION 03, (MERC-O- TRONIC TEST) (
TEST NO10 SOLENOID TEST
1Adjust scale no2: See page 322Turn selector switch to position no2 TOR RESISTANCEDISTRIBU-
3Connect the black test lead to one of the large terminals of solenoid4Connect the red test lead to other large terminal of solenoid5With 12 volt battery, place two (2) jumper leads on battery postsConnect the positive jumper lead to small terminal of solenoid6Connect negative jumper lead to solenoid housing and at same time, push-in solenoid plunger until plunger holds itself7The meter pointer must return within the OK blockIf not replace solenoid