Another 7.5 amp fuse issue question.

[Jhauschild]

Ok. So. I have read through several other posts in regards to similar issues. In fact, I’ve read several to get where I am. For starters, the machine is a 96 XP. It had sat for a season and wouldn’t start. I changed out the battery and the starter solenoid. I went to start it and it did so nicely. However, it would only run for 5 to 10 seconds. Checked things over, found the 7.5 amp fuse blown. I replaced it after checking connects. Again it stared and ran for about the same amount of time as previously. Again the fuse was blown. After doing some research, I removed the cover to the VTS. And, yes, there was water in it and the motor looked terrible. I thought for sure that this was it. I found a used VTS unit and motor and installed it. This ended up not fixing the problem. Still popping the VTS fuse. As a note, all power is lost when this happens. Any how, I looked over things a bit more and couldn’t find an issue. I was told to change out the rectifier/voltage regulator. It wasn’t too expensive so I did. I completely removed the VTS from the equation this time to see if it is part of the issue. Of course, it still blew the fuse. What else should I look at? What’s upstream from the fuse? I don’t have a schematic. And I think my patience is wearing thin. I did try a 10 amp fuse for chits and giggles….. I know, it’s a no-no. However, it stays running. I’m starting to think it maybe the MPEM. But, at what point does a person just stop sticking money into this?

 

[artr]

The schematic is available at seadoomanuals.net in the 96 shop manual. The wire that runs from the 7.5A fuse only goes to power the VTS module. If you disconnected the power to the VTS module and the fuse still blows then the wire is going to the wrong place or it is damaged and touching something other than the VTS connection.

 

[Jhauschild]

The schematic is available at seadoomanuals.net in the 96 shop manual. The wire that runs from the 7.5A fuse only goes to power the VTS module. If you disconnected the power to the VTS module and the fuse still blows then the wire is going to the wrong place or it is damaged and touching something other than the VTS connection.

Thank you for the response. I’ll have to dig more into the wiring. Just from handling the wiring, nothing jumps out as an issue. I ordered a can of Deoxit spray. Figured I would go through the connections.

 

[Jhauschild]

Well. The 15 amp fuse and the 7.5 amp were swapped. So, I think I found the problem. The VTS was drawing from a 15 amp while the other line, that usual draws through the 15 was drawing through the 7.5 amp. Chalk another one up for team stupid.

 

[artr]

Great, glad you resolved it!