SOURCE: volvo penta 740 lower unit will not go down.
Kind of sounds like the trailer switch is in control. Many of these switches have lockouts and if you move the outdrive past the trip point the other solenoids are dead. Watch fingers. There may be a tilt switch on the water side of the transom in the pivot housing.
SOURCE: volvo penta diesel starter wiring
I have a 1965 DePlas, with a '65 Volva penta, hardly a problem, had her for 18 years and sold her to my nephew, good engines. Anyway, here is a link that will help you get to the wireing that you need. Take care!!!! Guy
http://www.marinepartsexpress.com/vp_sch_fs.html
Take one spark plug out, connect it to its wire and lay it visible on the engine, press the starter and see if there is a spark.
No spark; check if there is power to the ignition coil, if power there, coil is bad.
SOURCE: How do I find where the hydraulic pumppower trim is on a Volvo penta ad31 boat motor
Mounted to the inside transom. Usually on the starboard side.
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