1978 evinrude will tilt up but not down - Boating

I suggest you go to this site and obtain a manual for your Evinrude engine. Hope it helps:

Literature

LOW FLUID POSSIBLY AND THE PUMP DOES NOT PUMP WATER .

go google and type in --wiring schematics for johnson outboard motor 75 hp 1981 model --- and see if there is a pdf version for down load
repeat the search but change the name to evinrude and look for a pdf version down load
go to a dealer service center and see if you can get a schematics for each from them
while it can be expected that the wiring should be the same as each brand is made in a different factory there could be a slight difference in the wiring set up that is causing the problem

evinrude 1978 -1979 have a capacity discharge ignition unit as the control for the spark system
it runs wires to an ignition coil
so I would be suspicious of that unit
check all connections for corrosion and bad connections
I typed in electrical schematics for 1978 evinrude out board engine and found a site --www.maxrules.com which in the list of schematics has 55hp 1977-1978
press on that and you get a schematics of the wiring diagram evinrude 1978-1979 55hp
now I am aware that you state that yours is 35 hp but if it has 2 cylinders then it is a fair bet that the wiring diagram will be the same
any way there are plenty of other sites that may be of benefit

Does t/tilt motor turn ,if not check fuse,if it turns check oil,if motor turns and has oil check manual release valve

Check fuse.try connecting trim wires from t/tilt motor direct to battery supply to see if motor is ok.t/tit solenoid could be faulty,switches could be faulty.broken wire in loom or control box

1978 It is in the model on an Evinrude. 6804.... 6 HP.....1978

Check tilt switch and trim tilt relay

have you got hydraulic trim/tilt? if so control button /switch will be on or near throttle handle-if not you will have to manually lift and insert pin at bottom of mount on transom

First make sure you are not in transit mode. Some outboards have a lever which keeps the motor tilted for trailering. You should have a fuse for the tilt motor, check that. If the pump is turning and it sounds like it is whining you are pushing air and either lost your hydraulic fluid or have an air bubble in the system. Check your fluid reservoir.