CMC Tilt & Trim Electrical Issue


  #1  
Old 05-29-23, 03:44 PM
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CMC Tilt & Trim Electrical Issue

I have a 1986 16' DuraCraft with a 40 HP Johnson (not that all that matters, but) with an aftermarket CMC model # PT-130 Tilt & Trim setup.

Thursday, I went out to check on the boat & the motor was tilted all the way up. I've never did that. Actually, when I winterized it, I specifically left the motor at 180 degrees. I tried to tilt it back down & nothing. I mean, nothing. No click, no hum. Battery is down.
Only thing I can think of is something shorted out & raised the motor up until the battery finally ran down. I put the charger on the battery & and its up to 12+ volts now. Still nothing by working the toggle switch.

There is a black line coming out of the control box with a black wire & white wire. It goes to a rubber coated box of some sort that has about 20 wires to & from it.
One of these is a the tilt up & the other is a tilt down. Can I connect either of these wires directly to a 12V hot & test the motor simply by doing that?

Any other advice/help would be appreciated.
Wiring diagram here:
https://www.google.com/search?q=cmc+...h=625&biw=1366
 

Last edited by Dixie2012; 05-29-23 at 04:39 PM.
  #2  
Old 05-29-23, 04:20 PM
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Not sure I am looking at correct schematic. There should be limit switches that remove power to the trim/tilt motor power relays when full up or down is reached in case the captain forgets what he is doing.
 
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Old 05-29-23, 06:07 PM
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This insulated block that has all the wires going to & from it is a Hella 4RD 960388-12 fuse block as near as I can figure out. I cant get a good picture of it on the internet but most of the 4RD models close to it are 3 - 5 prong relays.
Since its covered in some sort of rubber sealant to make it water proof, I dont want to tear into it yet until I get some feed back from you guys.

Its got several... 10 - 12 various colored wires going to & from it. Two of which are the black & white wires from the hydraulic lift. So many wires for only 3 - 5 plugs??? Just curious how this thing wires up if I need to replace it...???

I'm curious about how I can check this relay to see if its good or if its gone bad.
 
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Old 05-31-23, 03:50 PM
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If there are no electrical limit switches for up and down motor control, the ram cylinder must have a oil bypass hole that gets exposed when the ram reaches end of travel so the oil has a place to go as long as the pump motor is running. When pump motor stops, a check valve prevents oil from draining from the ram cylinder so the device attached to the hydraulics maintain the position. This could be your scenario but can't help more until you have answered the question about electrical limit switches?
 
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Old 05-31-23, 06:42 PM
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OK, This is a couple of relays in which the lift & trim motor wires are going to. I think one of these relays is bad. the prongs n one is bad. I'm going to attempt to find these relays on the internet & replace them.

The only switch that I can find in any respect is the 3 position toggle switch to operate the lift up or down.

Any advice on these relays is appreciated.






 
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Old 05-31-23, 09:00 PM
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would of started by checking power and ground to the hydrualic motor I did not look at the wiring diagram but generally both wires should show ground when the tilt switch is not being pressed and when you press the switch one wire will show power and one relay will energize press the switch the other way and the other relay energizes and the other wire will then have power.
 
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Old 05-31-23, 09:31 PM
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I checked power on both the blue & green wires to the toggle switch. I checked with volt meter & I also touched each of them to the + battery post. Nothing. The green connected to the + post should have made the motor tilt back down. The blue wire should have tried to make the motor tilt upwards. No click, hum, buzz... nothing.
The battery is testing at 12.5 volts after being charged.

There are no other wires going to the tilt motor. Only the back & white wire in the sleeve to the two relays. No ground or anything. I am assuming, it is grounded to the hull. The tilt has been working properly up until a month or two ago.

I'm still going to run by NAPA tomorrow & see if I can pick up those relays (or some compatible) & give them a try. Its worth $20 or so to start there. Hopefully I can give more info tomorrow... hopefully, that it is working again.
 
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Old 06-01-23, 02:23 AM
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its kind of similar to a window motor in the polarity is reversed on the wires causing the motor to run in both directions so disconnecting the relays and jumping power to one of the tilt motor wires and ground to the other should make the motor run if it is good the motor will go up or down and then just swap the wire polarity and it will go in the opposite direction.
would also check for power and ground at each relay it may be a bad relay as they do commonly fail and there contacts go bad which causes the motor not to work but that does not really explain why the motor was tilted up all the way not sure how many tilt switches you have I know some will have up to 3 one on the motor one at the front and one at the steering controls is it possible that something may of leaned on one of the switches.
 
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Old 06-01-23, 02:48 AM
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so if you look at the relays you will have 5 pins each and there is typically a number stamped next to them or a diagram on the relay itself pin 30 should go directly to the trim motor, 87 and 87a one will be ground the other power usually fused battery power so simply jumping one relay to 30 to 87 and the other to 30 to 87a should cause the motor to run.
pins 85 and 86 is the actual relay coil and will go to the tilt switch or switches still need ground on one and power on the other here also, when the switch is pushed in it usually sends power out but it could work in a switched ground also but using a voltmeter or test light between those pins operate the switch should show 12 volts or light the test light when the switch is pushed.
 
 

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