I don't think it's the prop with what your saying. When the prop slips your engine over revs and your boat slows. Is that happening? Doesn't sound like it. In the past others here have stated that you should look for a damaged wire, probably one under the flywheel that is shorting out when you...
Here is a post in 2013 with a similar issue, a way to test (should be able to make sure pathways are connected) and then they list a place that repairs them.
Have you ever plugged in a different control box just to see if that solves it?
Anyhow, enjoy the read...
Viper, you have to look at the dates of the post, in this case 2007. Also, if you read the thread in his first post he doesn't have a choke. He has a primer. If you have a question or need support after reading an old posting, just start a new post.
Amps doesn't have anything to do with it, it's pickup points in one revolutions of the flywheel. I would think the directions of the tach would be correct.
I don't think it will harm your tach if it's set wrong, it will just read incorrectly. You can then turn off the motor and set it to the other calibration. Don't trust me on this one though, let others confirm.
Ok, last post for me on this one. The part number you provide in the picture is one of the teleflex xtream cables. I couldn't find it. Teleflex and Seastar have joined each other and it looks like Sierra did to. I found Sierra teleflex cables with different part numbers. Quite a confusing go...
The picture is not of a throttle cable and shifter cable, that is the old shifter cable and the new one. He says, if I'm interpreting this correctly, those are the orientations when they are both in the neutral positions.
Mine also just run down the starboard side. To me, it would appear like you just installed it incorrectly in the box. Did you compare both ends before you installed? That would be the clincher.
Sorry, still having a hard time evaluating. Picture is of two shifter cables next to each other. But they both can't be hooked up to the box at the same time. Are you saying that is what they look like when they are individually hooked up? (Old one is in the middle of it's range and new one is...
To me it looks like your old one is in neutral or close and your new one is in the forward position. Are you saying you have both cables into a control box???