No Power!!!

[thisuldoit]

Re: No Power!!!

I just took apart the switch and tested the wires. The red coming into the switch has 12V. When I push the trim button up the green wire registers nothing. There is a purple wire for the trim down direction, but that also registers nothing. Also, when I push the trailer button (blue and red wire) nothing happens.

 

[thisuldoit]

Re: No Power!!!

Update: The switch is good. I was testing the wires in the wrong direction. I have a theory, but I need it validated. There are two wires that connect to the purple and blue wires that go from the trim area and follow the hyrdolic lines down toward the outdrive. On the outdrive there are two wires that are loose and look like they go to a round object on the outdrive. The object had "T.L." on it. Could these loose wires be the sort or is that just something else.

 

[Boatin Bob]

Re: No Power!!!

TL most likely is your "trim limit" switch and that could be your problem. The trim limit switch does just that (limit how much you can trim) If the switch is bad or maladjusted it can think the drive is already raised enough and won't let it go any higher.

 

[thisuldoit]

Re: No Power!!!

I removed the trim limit switch, and the two wires coming out of the switch are severed and are extremely short. I am assuming that I need to purchase a new one. Thoughts?

Thanks!

 

[b00tstrap]

Re: No Power!!!

The cost of the switches are the "easy" part. I have the same problem on my 88 merc 5.0L. I decided to wait until off season to replace the switches, because it involves quite a bit of work.

I found this link helpful:

[url]http://www.outdriveshop.com/replacing_trim_senders.html [/url]

 

[tommays]

Re: No Power!!!

http://www.boatfix.com/merc/Servmanl/6/6C1R3.PDF

this should help you


dont worry about the trim limit switch at this point

It only stops the drive at the trim limit IT does not stop it from going DOWN or going UP from the trailer button

Tommays

 

[thisuldoit]

Re: No Power!!!

That will really help. I was looking for a wiring diagram for the trim system. Now I have something to reference.

So let me get this straight. Even with the trim limit sender disconnected it should still trim down using the trim button, and it will trim up all the way using the trailer button. It will not trim up, however, using only the trim up button.

Thanks so much! I will work on that this week.

 

[thisuldoit]

Re: No Power!!!

Ok. I have tested all of the wires on the trim system. The wires at connection 14, 15, 16, 17 on the diagram are severed. I have 12V on the red in the throttle switch and on the wires leading out of the throttle switch when I use the respective switch. I have 12V on the red leads on the up and down solenoid near the trim motor. I have 12V on the 20 Amp fuse at connection #18. I have 12V on the 110 AMP fuse. I have 12V on the female side red wire at connection 13, but I do not have 12V at the male side red wire at connection 13. I do not have 12V on any wire at the male side at connection 13 even when I operate the respective switches. Is there possibly anything between the throttle switch and the male side at connection 13 that could be causing a loss of 12V? Could the male plug at connection 13 have gone bad?

 

[Boatin Bob]

Re: No Power!!!

Can't see your attachment for the diagram, it says it's damaged file, maybe you can just post the link. Are you using a DVM or an analog meter for these checks? Sometimes a high resistance short will lead you down the garden path with a DVM thinking you have 12v when you really don't. A 12v test light will work much better sometimes as it will draw a bit of a load.

 

[thisuldoit]

Re: No Power!!!

I am using a DMV for these tests. I guess I could get a 12V test light.

Here is the link:

http://www.boatfix.com/merc/Servmanl/6/6C1R3.PDF

The diagram that I am working off is page 17 of this document. Thanks.

 

[Tom Scully]

Re: No Power!!!

You will not see any voltage on the male side red wire at connection 13 with the plug disconnected. Are the two blu/wht wires at female connection 15 still in the connector body? If not they need to be spliced together. Make sure you have a good ground to the solenoids at conn. #9 and 7. If the fuses are good and the fuse holders are clean, and as posted the switch is good, when the switch is pushed to the trim down position you should measure +12 where the grn/wht wire from the trim switch lands on the down solenoid, (conn #6 if I am seeing it right).
If the coil in the solenoid is good you should here it click.
If not then verify with the following:
Check the coil for the down solenoid using a small jumper wire with alligator clips to connect the red wire(+12v) at connection #4 to the + input for the coil on the down solenoid; (where the small grn/wht wire is, conn #6 if I am seeing it right). The solenoid should click and if all else is OK the motor should trim down.
To check the up solenoid use the same procedure but connect the jumper to where the blu/wht wire lands on the up solenoid, (conn. #8 if I am reading it right).

 

[thisuldoit]

Re: No Power!!!

Ok. I tested the small green/white wire, and small blue/white wire at each selonoid using a DMV and pushing up or down on the throttle switch. There was 12V on each respective one when I did this. I wanted to do that first to make sure that we were getting power to the seloniod from the switch.

I then connected to the red wire on each respective selonoid (12V+) and then to the respective small green/white or small blue/white wire coming into the particular selonoid. I did not push up or down on the throttle trim switch during this test. Nothing happened. When I connect from the red connection on the selonoid to the large blue/white or green/white wire that goes to the motor, the motor runs either up or down. Is it possible then, that both of the seloniods are bad? The boat was sitting for three years before I bought it.

Thanks.

 

[tommays]

Re: No Power!!!

ITs more likely bad ground connections on the selonoids than for both to NOT even be clicking



When i repiared mine i had to remove and clean EVERY CONNECTION and reseal it with liquid electric tape


Tommays

 

[Tom Scully]

Re: No Power!!!

Like tommays said more likely its a bad ground that both coils. As mentioned before make sure you have a good ground to conn 9 and 7.
Check the resistance of the coils. Put the DVM on a low ohms scale, I'm not sure what type of meter you have, (r x 10 or a 200 ohm scale should work). The coils should have a low resistance, probably somewhere between 5 and 15 ohms. Measure between the ground for the coils and the small grn/white and then ground and the small blu/wht.

 

[thisuldoit]

Re: No Power!!!

Ok. I cleaned all of the connections on the selonoids. I then tested the ohms between the small blue and small green and their respective grounds. They both registered at 5.5 ohms. I have reconnected the positive terminal on the battery and still nothing.

 

[tommays]

Re: No Power!!!

There should be a GROUND from there to the ground cable thats bolted to the pump frame that may NOT be compleating the circut

Bolt 10 in the diagram

grounds are the :devil:in marine electric

There was a littel bit of rust on mine after 9 years in saltwater i got to know ALL the connections very well

Tommays

 

[thisuldoit]

Re: No Power!!!

I removed and cleaned the three wires in that bolt, the bolt, and the area of the pump housing that it connected to.

 

[thisuldoit]

Re: No Power!!!

I still am getting nothing when I connect the red wires on the selonoids to the small green or small blue on the selonoid? When I test the red wire on the selonoid using the ground on the selonoid, I get 12.72V, so that ground should be good, correct?

 

[woody20]

Re: No Power!!!

selonoid = solenoid switch, which is a specific type of relay that internally uses an electromechanical solenoid to operate an electrical switch; for example, an automobile starter solenoid, or a linear solenoid, which is an electromechanical solenoid.

If you tried it with 12volts at the trim motor then I would change one selonoid and and try it. If it works your golden if not just return them. Selonoids and relays do die.

 

[Boatin Bob]

Re: No Power!!!

I then connected to the red wire on each respective selonoid (12V+) and then to the respective small green/white or small blue/white wire coming into the particular selonoid. I did not push up or down on the throttle trim switch during this test. Nothing happened. When I connect from the red connection on the selonoid to the large blue/white or green/white wire that goes to the motor, the motor runs either up or down. Is it possible then, that both of the seloniods are bad?

If you mean you took a jumper from the +12v red wire and went to the small blue/white and green/white and you did not hear the solenoids click and the ground is OK you must have 2 solenoids that have seized up inside. I would still feel better if you used a 12v test light for this only because I got burned once by a DVM but I think it's time for new solenoids.