Power trim stalling motor (hpdi )

[N1NE1]

(02 Yamaha 200 hpdi )This could be completely unrelated but ..So at the end of last season I was having an issue with my motor not passing water through the pisser tube . Cleaned it out everything works there now . The rectifier was jammed up with some dry salt. Ever since then when I use the power trim switch on the controls when the motor is running it nearly kills the motor or stalls.it works fine when motor is not running . I checked for any pinched wires around the rectifier and fuse box, nothing. If I use the switch on the side of the motor I have no issues at all even while running. I tried checking the block to see if it was shorting and came up with nothing. Any suggestions are greatly appreciated before I look into this soon with boating season coming up.

 

[99yam40]

Sounds like the T&T is pulling the voltage down.
clean all battery cable connections and make sure your battery is load tested and good

 

[N1NE1]

Sounds like the T&T is pulling the voltage down.
clean all battery cable connections and make sure your battery is load tested and good

If I use the trim switch on the side of the motor it’s perfectly fine , only when I use the one on the controls .

 

[99yam40]

that does not make sense to me.
Does the T&T work from both switches?

You might try to measure the battery voltage while hitting each of the switches to see if there is a difference

 

[N1NE1]

that does not make sense to me.
Does the T&T work from both switches?

You might try to measure the battery voltage while hitting each of the switches to see if there is a difference

Yes there is a switch on the side of the motor and one on the throttle control. Yes it’s confusing me too

 

[Chris1956]

The PTT switch on the motor is likely powered directly from the starter solenoid on the engine. About 2' of wire which is pretty well protected from the elements and accessible for inspection.

The control mounted PTT switch is powered by the boat harness positive wire, or perhaps a dedicated power wire in the harness, at the control. Then the power needs to travel back to the engine, to power the PTT. The circuit paths are quite different. Also, boat harnesses are usually a fixed length. Any leftover cable is coiled and tossed into the bilge. You might check it for bad insulation.

In summary, the control mounted PTT switch needs to pull about 3A of power thru the 25-30' boat harness twice, to energize the PTT relays. You might use an ohmmeter to see where the resistance in the circuit lives.

 

[99yam40]

The PTT switch on the motor is likely powered directly from the starter solenoid on the engine. About 2' of wire which is pretty well protected from the elements and accessible for inspection.

The control mounted PTT switch is powered by the boat harness positive wire, or perhaps a dedicated power wire in the harness, at the control. Then the power needs to travel back to the engine, to power the PTT. The circuit paths are quite different. Also, boat harnesses are usually a fixed length. Any leftover cable is coiled and tossed into the bilge. You might check it for bad insulation.

In summary, the control mounted PTT switch needs to pull about 3A of power thru the 25-30' boat harness twice, to energize the PTT relays. You might use an ohmmeter to see where the resistance in the circuit lives.

he said they both raise and lower the motor ,but the one on the control causes the running outboard motor to mess up.
Not the T&T motor

 

[Mc Tool]

Is the charging system working ? What does battery voltage drop to whilst using the ptt ?

 

[N1NE1]

Once I start getting the boat ready for the season I will check everything. Just trying to get some opinions ahead of time .

 

[Chris1956]

Gee, I was trying to help him find the source of the voltage drop that affects the running of the engine.

HDPI engines use lots of power for fuel injection and ignition. When the voltage drops, bad things happen.

 

[99yam40]

Gee, I was trying to help him find the source of the voltage drop that affects the running of the engine.

HDPI engines use lots of power for fuel injection and ignition. When the voltage drops, bad things happen.

well I sure sounded like you were pointing at the 3 amp draw of the T&T relay you mentioned, and that relay was working fine

"In summary, the control mounted PTT switch needs to pull about 3A of power thru the 25-30' boat harness twice, to energize the PTT relays. You might use an ohmmeter to see where the resistance in the circuit lives."

 

[Chris1956]

Gee, the helm mounted PTT switch powers the relays that power the PTT motor. I think the relays take about 3ADC. It certainly is not much more than that, although it is apparently enough to affect the engine running.

The PTT functions fine from the motor mounted switch, which uses the same relays to power the PTT motor. Yet this does not affect the running of the engine.
I think those two factors point to the boat wiring harness.