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5.7 Volvo-Penta DP Trim not working

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kirkj11

New member
Trim worked in the yard. Stored the boat this winter with the lower unit in the down position. Moved unit to transport position. Lowered again to check all fluids then moved to transport. All worked fine. Then put it in the water and nothing. No noise, nothing. I checked the fuse under-dash and fuse on trim motor, both are fine. Jumped the motor directly to battery. Motor made noise but the unit didn't move, (maybe it won't). Could the switch be bad? Any help would be great. Thanks
 
If powering the motor via other than the relays did not render any pump action, then it's likely that the motor is bad.

Be sure to take your existing motor in with you when you purchase a new one. If memory serves me, there were two motors used.

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Jumped the motor/pump again and had wife watch not daughter. The lower unit moved up and down. So I'm guessing not motor/pump, hopefully. Any other suggestions?
 
Just checked the relay connections at the motor. Would both relays go bad at same time? The are shiny and look new, no corrosion. Should there be power to the trim switch on the throttle control at all times? If so, I don't have any.
 
kirkj11 said:
1.... Would both relays go bad at same time? The are shiny and look new, no corrosion.

2.... Should there be power to the trim switch on the throttle control at all times? If so, I don't have any.
Click to expand...

1.... Unlikely.... but I'd not rule it out without investigating further.
You'll need a VOM.
Go to work and test everything for power.

2.... Trace the circuit out, and see where the control switch recieves it's power. It should be simple enough to learn why there is no power here.


Use the ole P of E.... process of elimination.
Check/test one item, and one item at a time.
Move to the next item ONLY after the previous item has been explored fully.

The P of E when used systematically and methodically, will not let you down.

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I agree that it's unlikely that both relays would go bad simultaneously but I believe both relays need to be working to run the motor. One relay provides negative and the other provides positive when the motor raises the drive. The polarity is reversed when lowering.
 
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