Trim motor test results

[rstex]

1985 150hp evinrude E150STLC0S
Trim motor model number 10810N
The book calls for 394176 Trim motor

Trim motor was only working intermittently. Both trim telays tested within range. Fully charged battery, clean connections etc. I bypassed the relays and replicated the same issue.

I removed the Trim motor and tested the resistance up and down. Each movement tested at 3.1 to 3.5 or so. My book listed 3 brands and what they should test under a no load test. Not knowing my current brand i wasn't sure. Assuming it was the lowest of the 3 listed it still tested below value

Now to the question. Is my test result too far off to the point where cleaning it won't help. I've read/seen where taking it apart, cleaning, etc led to the motor coming back to specifications.

 

[boobie]

Did you check the trim switch ??

 

[rstex]

Did you check the trim switch ??

yes. I bypassed switches, relays etc.

 

[tblshur]

Take it apart, take it to a starter shop or buy new

 

[Crosbyman]

did your test include feeeding bat & grd directly on the starter wires thus bypassing all potential sources of problems " above" the starter itself ??

looks like a 2 wire motor ....try +12 & grd one way then reverse the polarity to reverse the motor


how did it react ??

 

[rstex]

did your test include feeeding bat & grd directly on the starter wires thus bypassing all potential sources of problems " above" the starter itself ??

looks like a 2 wire motor ....try +12 & grd one way then reverse the polarity to reverse the motor


how did it react ??

yes, I bypassed the relays and replicated the same issue. This was done with the motor still attached to the system.

 

[Crosbyman]

see example of wiring

 

[rstex]

I am mostly puzzled because of the low current. I was expecting a high resistance indicating a problem with the motor.

 

[rstex]

see example of wiring

yeppers used that to test the relays

 

[Crosbyman]

disconnect trim motor wires and apply bat-grd directly on trim motor wires

 

[rstex]

disconnect trim motor wires and apply bat-grd directly on trim motor wires

Yes. I've done that. I completely isolated the incoming electrical to the motor while it was still attached to the system. I replicated the same intermittent issue by directly supplying power to the motor.

 

[Faztbullet]

Thats a aftermarket motor someones put on there..most likely a DBelectric or Amazon Chiny so you cannot go by Selco spec's

 

[Crosbyman]

I completely isolated the incoming electrical to the motor while it was still attached to the system. ???

sorry to insist...did you DETACH wires to test the motor on its own with bat & grd

 

[rstex]

I completely isolated the incoming electrical to the motor while it was still attached to the system. ???

sorry to insist...did you DETACH wires to test the motor on its own with bat & grd

Yes. I disconnected the wires directly from the trim motor. I supplied power directly to the blue wire from the trim motor and a ground directly to the green wire. And vice versa

 

[dingbat]

Measuring resistance through the armature confirms that the windings (paths) are intact. Does not tell you if the insulation between the (paths) are intact.

You can not adequately test a motor (armature) w/o a growler.

Operation of a Growler to test armature shorts

Can someone explain to me how a Growler for testing electric motor armatures works please? I have obviously read the Wikipedia Growler page but it is still foggy. So the growler unit acts as the pr...

electronics.stackexchange.com

 

[rstex]

You can not adequately test a motor (armature) w/o a growler.

what do you think of the low current draw results? You think it's an inadequate test?

 

[Crosbyman]

Could be just poor internal contacts or maybe used carbon brushes

low current draw is usually caused by a higher resistance which in turn can be the result of oxydation in crimped contact points, weak springs on brushes worn out brushes , pitted contacts etc...
maybe a motor shop could look at it & rebuild or as suggested get a new one. ... or you do thexploring at this point .

you would have to open up the motor if you are comfortable with such a venture.

 

[dingbat]

what do you think of the low current draw results? You think it's an inadequate test?

As noted above, it’s a useless measure to determine the condition of a motor.

intermittent operation of a motor points to winding or connection issues.

Given the circumstances, my first test would be to check the operation and wiring between the switch (contacts) and the relay stack.
Pull power wire at helm switch and relay stack on motor. Check resistance in wiring. Flip switch off and on multiple times to check for intermittent failures.

 

[Crosbyman]

he already tested at the motor wires and reproduced the problem looks like bad motor, bad crimps?, bad innards

Yes. I disconnected the wires directly from the trim motor. I supplied power directly to the blue wire from the trim motor and a ground directly to the green wire.

 

[rstex]

I opened the motor. Only thing i could find was a brush that was stuck? Everything was clean or cleaned. The gaskets for top and bottom of case were deteriorated. So given the circumstances I purchased a new motor. As a note... after i put it back together i decided to perform a no load test once more. The values did come up slightly to 3.9 to 4.1
I appreciate all the replies. I will try to update after the new trim motor is installed. Thanks again.