battery not charging 01 z150tlrz HPDI

[pancake]

i just made it back to the dock while i watched the voltage decrease down to under 11 volts. i need to check the regulator /rectifier but am a little unclear as to where to check the voltage output . Any suggestion on where to check and any ideas on the problem. Battery is holding a good charge and connections look good. thanks Its a 2001 z150tlrz HPDI 2 stroke.

[boats.net]

Check it at battery, voltage should increase slowly when engine is running.

[pancake]

voltage

if the volts ck bad at the battery, can you get a reading directly off the rectifier while the engine is running?

any idea why so many battery cable failures?
Can't i just make my own new battery cables?

[boats.net]

Yes you check voltage at red wire at regulator. You can make your own battery cables, lot of people do.

[pancake]

BAD Red wire connection

turned out to be a bad connection. the red wires off the Rectifier that connect to the back of the fuse box was not letting electricity thru to the fuse. i cleaned it and used some dielectric grease for corrosion prevention. It went right back up to 13.8 volts on start up.

Can you buy just the plug-in connectors that go into the back of the fuse box? this one was blue with 2 red wires off of the rectifier.

[boats.net]

No Yamaha doesn't sell the connectors separately.

[tonynorie]

My motor is a 2001 200 hpdi tlrz and the battery is being charged but I don't think the charging system is putting out enough......here's an example:

With my Optima battery at full charge - 12.9v - and I leave the dock and power up to 4000 rpms, my charge reading on the gps goes up to only 13.4. A couple guys have told me it should be more like 14 volts....in that range. By the end of the fishing day, my battery voltage drops to 11.5 or so with the motor is running about half the trip (much of it is idleing) with the only draw being a livewell pump and electronics.

Any ideas?

Thanks!

[pancake]

check for corrosion

i'd look for corrosion at the blue connector which goes into the back of the fuse block. remove the 2 silver screws which hold the fuse block to the motor and the 80 amp fuse is where the regulator connects to the block. your motor should be similar. mine actually had green corrosion growing in there. maybe your juice is not getting thru like it should. just a idea to check. I didn't need to remove my fuse out of the block to clean. mine jumped to 13.8 volts plus or minus .3 on engine start up. i also put the dielectric grease into the connector to prevent further corrosion

[tonynorie]

i'd look for corrosion at the blue connector which goes into the back of the fuse block. remove the 2 silver screws which hold the fuse block to the motor and the 80 amp fuse is where the regulator connects to the block. your motor should be similar. mine actually had green corrosion growing in there. maybe your juice is not getting thru like it should. just a idea to check. I didn't need to remove my fuse out of the block to clean. mine jumped to 13.8 volts plus or minus .3 on engine start up. i also put the dielectric grease into the connector to prevent further corrosion

Thanks Pancake......I'll check it today.

[pancake]

2016 update, corroded wire into fuse block

same problem reoccurred after 4 seasons, just noted a drop in voltage on my fishfinder. further investigation revealed the wire going into the fuse block were badly corroded. had to completely disassemble the connectors and clean out the green corrosion. hope it all checks out.

[zenoahphobic]

same problem reoccurred after 4 seasons, just noted a drop in voltage on my fishfinder. further investigation revealed the wire going into the fuse block were badly corroded. had to completely disassemble the connectors and clean out the green corrosion. hope it all checks out.

I thought when I first saw this thread, this poor b.... ah fellow has spent the last six or seven years trying to fix his problem

Corrosion only occurs in the presence of water. Unfortunately water is also in air, but green corrosion (cupric oxide?) after a few years suggests rain or even seawater has gotten to the connections. After replacement try keeping it dry and add something like Corrosion X to the connections.