Losing tach

That grey wire originates up here at the coil but also goes thru a 22K resistor then the 8 pin plug then to the dash

8122pbrainard wrote: Todd, Have you looked for this 8 pin?  KENO wrote: The 8 pin connector is at the back of the engine and connects the engine harness to the boat harness that goes to the dash. Remember, you just don't want to add the dielectric grease to them. Make sure the male and females ends are cleaned up first. You what to look for corrosion that may be the source of the tach problem.

I can’t seem to find it. There are quite a few things all wrapped up in tape. Anyone have a pic of where exactly it should be?

Let me start by saying THANK YOU to everyone for their responses.  I'm sure it can be extremely frustrating dealing with a guy that hasn't worked on this stuff before.  I'm a quick learner but haven't played around with the engine/wiring too much.

KENO wrote: I don't think you really care if it's an open or a short or a twitch or spike or whatever that's causing your issues as long as you get it fixed Looking back, I don't see that you unplugged the PP and drove the boat to see if the tach malfunctions  with PP unpowered. I'd do that, so you can say for sure that the problem is not in the PP or the tach, then you can look at the diagram (Fig 6-4) that's been referenced a couple of times by a couple of different people. Only you and the PP guys know what you have for a PP setup, but I figure they could tell you how to pull the tach signal from upstream of the "black box" and power it from the battery too.  They had PP for GT40's before they had the digital gauges so there must be a way to get that signal relatively easily. The tach signal starts at the coil, goes thru the 22K resistor and your 8 plug connector along with the associated wiring to get to the black box. You really don't know that it's a power loss at all and going by your voltage numbers from the other day, it doesn't appear to be.  It looks a lot more like a signal loss, but I think you already know or suspect that

I have not disconnected the PP as we always use it for skiing through the course and that’s the only time we run the boat. PP said they pull their Rpm separate from the tach so they are “confident” it’s not a PP issue...

I should have been more clear. Is there a way to tie into the grey wire back at the ecu without cutting it so that I can run a wire directly to the tach and PP? I assume the 8 pin connector is plugged into the bottom of the ecu?

I don't think you really care if it's an open or a short or a twitch or spike or whatever that's causing your issues as long as you get it fixed

Tbarile wrote:   Yes, they say it’s not a PP issue because the tach is losing rpm signal as well. They say there is something causing the rpm signal to be lost, possibly a short in the rpm signal wire.

Have you tried calling Perfect Pass tech support? They always help me graciously when I have any issues.

I got the reading off the back of the tach, PP has a 6 pin connector so there isn’t a place to pull from.

So voltage when running was 13.3-13.7. When we lost rpm signal it was 13.2-13-3. Really didn’t change.

DVskier wrote:  Twitch is not a valid electrical term. Never heard it in over 4 hours of formal training.

8122pbrainard wrote: Tbarile wrote: Out of curiosity. If the voltage isn’t going to change, only “twitch”, how will I see this? Wouldn’t I have to be focused on the VOM the entire time while driving? If so, that’s not realistic as I need to be watching how I’m driving through the course. You want to look for low voltage. The PP's don't like low volts and the reason I suggested getting a reading. Don't worry about the twitch. I should have never brought it up. I only mentioned the twitch when I said there are times when I actually prefer an anolog gauge. Again, for you to get a voltage reading, you can use ether a digital or analog. Again, don't worry about the twitch. Put that out of your mind!

Out of curiosity. If the voltage isn’t going to change, only “twitch”, how will I see this? Wouldn’t I have to be focused on the VOM the entire time while driving? If so, that’s not realistic as I need to be watching how I’m driving through the course.

Aft bulkhead. Was on a cruiser 547’ 55’ beam.

Tbarile wrote: KENO wrote: Maybe it's a terminology thing Your 02 has Teleflex gauges right? Maybe your 02 has a box with a different name like "black box"  DV Skier has an 04 with a Chevy and I'd figure Faria gauges so he may have a Faria gateway box in a different spot. I originally had teleflex gauges but had to swap them out for the Faria because they stopped working.

KENO wrote: Maybe it's a terminology thing Your 02 has Teleflex gauges right? Maybe your 02 has a box with a different name like "black box"  DV Skier has an 04 with a Chevy and I'd figure Faria gauges so he may have a Faria gateway box in a different spot.

I originally had teleflex gauges but had to swap them out for the Faria because they stopped working.