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A little help with trim and oil sender harnesses please

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A little help with trim and oil sender harnesses please

Old 06-10-2021, 11:14 PM
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Default A little help with trim and oil sender harnesses please

I realize this has been gone over before. Iíve been reading and researching but Iím still confused. I have a 2002 Yamaha F115 that Iím trying to get the
6Y5-8350T-83-00 multi function tac hooked up. So far I have the RPMs working and the back light working. The problem is the trim indicator blinks. My gauge is the one with the two 4 pin connectors in the back. On the motor side I have the male four pin connector with red maybe pink / black wires and gray dead end going to my trim sender. Then the other connecter on the motor side is a female four pin with two wires going into it faded but I think pink with pink black stripe. I believe those two wires to be the oil/temp sensor connection. My local boat shop and Yamaha dealer sold me a four wire male/ female four pin cable with understanding it would link both trim and oil/temp from motor to gage. This cable connects the multi gauge to what I think is the two wire oil temp connection when plugged in I do get two black bars on the oil/temp gage that quickly disappears but trim indicator blinks on top bar. Soooo my question is did they sell me the wrong cable ? I have two four pin connectors on my multi gauge tac and I have a separate connector for my trim sender and another for my oil/ temp on the motor side. Do I need two cables from motor to multi gauge, where am I going wrong what am I missing ?
Old 06-11-2021, 03:41 AM
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Yamaha over the years has made changes to the 6Y5 multifunction tach
and the wiring for its trim/low oil pressure/overheat indicators in multiple ways,
it is bewildering.

your engine has the two plugs,
so yes, you need the two cable harness.


On the back of the gauge,
there is a rubber grommet,
down below, some tiny white dip switches;

you need SW2 set to "OFF", and SW3 to "ON"
(and they likely are)

if SW1 is "ON" change it to "OFF"
see if that gets your trim indication working

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Old 06-11-2021, 04:51 AM
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Thanks for the reply. Pretty sure I have the dips set to on off on first switch being 2 wire trim. Only a red and black wire come from sender
Old 06-11-2021, 04:55 AM
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The only wiring harnesses I can find with two plugs on each end are labeled ďconventionalĒ does not seem like the proper one for a digital tac and they are pricy so I donít want to order without knowing itís the right one...
Old 06-11-2021, 05:08 AM
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If you have looked at the trim sender and it is only two wires,
then certainly the dipswitch should be set accordingly.

Your 6Y5 tach IS a 'conventional' gauge,
despite its "digital" display,
it uses analog communication -
not the digital data transfer of the later Command Link gauge.

Regardless, you have the trim/oil harness for that gauge & motor
that's why the plugs mate.

One plug is for the overheat and oil pressure indicators,
the other plug is for the trim position.

There are pink bullet-connector jumper wires on the tach harness, yes?
are they joined or separated?
Old 06-11-2021, 05:38 AM
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I believe the instructions I found online for the tac said to leave the pink wire bullet connector hooked up. Hereís the part number for the harness I found
68f-82553-A0-00 Itís a two connection harness on both sides. Itís like 170 bucks Iíd hate to buy It and not be the right one for my 2002 fourth stroke ?
Old 06-11-2021, 06:06 AM
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So the harness they sold me does have 4 wires including a pink. However when plugged in it only mates with the oil/temp connection additional two wires in that harness pink and gray donít mate in that plug. I have a second plug on the motor side that definitely goes to the trim sender. The mechanic claimed that the trim sender plug did not need to be hooked up. Only the plug to the harness they sold me. I feel like he is not correct. That would leave no wires hooked up to the trim sender whatsoever. This is why I feel like I do need the above mentioned plug with two connections on each side. Iím only guessing i donít want to buy an expensive harness without knowing it is the right one especially since the one they sold me does not seem to be correct.
Old 06-11-2021, 06:22 AM
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Old 06-11-2021, 07:05 AM
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Originally Posted by 70Bronco View Post
. My local boat shop and Yamaha dealer sold me a four wire male/ female four pin cable with understanding it would link both trim and oil/temp from motor to gage.
Originally Posted by 70Bronco View Post
So the harness they sold me does have 4 wires including a pink. However when plugged in it only mates with the oil/temp connection . .
Ahh OK I obviously have not been 'with it' this morning.
There is an Oil/Trim harness for 2005-and-newer engines that consists of only 4 wires/ 1 plug on each end.
There is an Oil/Trim harness for pre-2005 engines that consists of 8 wires / 2 plugs each end.
I failed to grasp that you were working with the newer type harness.

However, "at the end of the day"
you only need 3 wires connected between the gauge and engine,
and you have 4;
if you are willing,
- cut your engine 'pink' wire
(the one in the plug for which you have no mating harness plug)

- cut the wire of the harness, that is connected to the pink of the gauge

and splice them.


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