Yamaha Trim Tilt Constant Ground?

[Skipjack66]

I have a 1990 90 horsepower Yamaha what I don't find on the internet in forums and posts is anyone who discusses the fact that a solenoid should be in constant ground until activated to positive. if I take the blue and green wire and hook them directly to positive and negative I can make the motor go up and down by reversing polarity. My solenoids act properly in that when using the trim button at the helm pay click and then become positive on the other side of the solenoid. What I did find out that there should be a solenoid with constant ground similar to the boche relays with an 87 a post on the back of them. Can anyone tell me if I don't have negative on my solenoid when not activated is the solenoid at fault or does it seem like there is a wiring problem?

 

[dingbat]

How do you get negative voltage in a 12 volt negative ground circuit?

The trim motor changes direction by reversing polarity.

The blue and green wires are direction (up or down).
Ground is typically tied to motor via ground strap under a motor mounting screw.

Example:
Solenoid 1 routes power to blue (up) wire. Solenoid 2 routes power to green (down) wire.

Sounds like you have a bad switch, relay or grounding problem

 

[Texasmark]

If like others the relay has to be DPDT, 2 are required and they are complementary wired....you have to activate/deactivate both to get power applied to the motor and depending on whether the blue or green wire has the relay energizing current, will determine which pins on which relay are applying + and which are applying - to the motor. The + and - are hard wired to the relays. The internal contact position is what determines what, if anything goes out.....you can't have a hard wired ground to a 2 pin bi-directional motor if you want to make it bi-directional.

 

[dingbat]

 

[Skipjack66]

How do you get negative voltage in a 12 volt negative ground circuit?

The trim motor changes direction by reversing polarity.

The blue and green wires are direction (up or down).
Ground is typically tied to motor via ground strap under a motor mounting screw.

Example:
Solenoid 1 routes power to blue (up) wire. Solenoid 2 routes power to green (down) wire.

Sounds like you have a bad switch, relay or grounding problem

Thank you for your reply. When I hook a jump box to the motor I can make it go up and down. My question really is how does the opposite wire (green) connect to negative when the blue wire is fed positive thru the solenoid. The solonoids are both working I think. I get the signal from the trim switch which clicks the solonoid then I have positive on the motor side of the solonoid. What I don't get is how a wire connected to the solonoid gets negative to make the motor work. I have old school solonoids like a starter solonoid. Not the Bosch type solonoids with an 87a negative. I have even connected a jumper negative wire to a bolt that screws into the motor housing. Still not getting movement from the motor, but it works fine when not using the solonoids???

 

[dingbat]

Thank you for your reply. When I hook a jump box to the motor I can make it go up and down. My question really is how does the opposite wire (green) connect to negative when the blue wire is fed positive thru the solenoid. The solonoids are both working I think. I get the signal from the trim switch which clicks the solonoid then I have positive on the motor side of the solonoid. What I don't get is how a wire connected to the solonoid gets negative to make the motor work. I have old school solonoids like a starter solonoid. Not the Bosch type solonoids with an 87a negative. I have even connected a jumper negative wire to a bolt that screws into the motor housing. Still not getting movement from the motor, but it works fine when not using the solonoids???

In effect, you have to swap power and ground to change direction. You can’t do this with one single acting solenoid. You need two solenoids or a couple of relays in front to flip the connections.
Is this what you are dealing with?

Clean Used OEM Yamaha 1990 90 HP Outboard Tilt and Trim Relay Block | eBay

Find many great new & used options and get the best deals for Clean Used OEM Yamaha 1990 90 HP Outboard Tilt and Trim Relay Block at the best online prices at eBay! Free shipping for many products!

www.ebay.com