[Bunger]

The rex valve controls water to the headers. And yea ill put the ball and spring back in that should def help. And eventually ill
Put the valve off the pump but i dont understand how that lowers pressure? Seems like it would
Only lower the volume of
Water flowing through the motor? Correct me if im wrong.

[HaulsBalls]

The valve off the pump will not lower the pressure but it will lower the volume and in turn change engine temp up or down.  The pressure will change depending on how water exits the engine(hose size, fitting size, amount of water dumps).  I just increased the size of cooling lines on my engine last season due to a bit high water pressure on my block, now it never gets too high that it causes concern.

[Bunger]

What about alternators? I spun the + post on mine and broke a little diode thing on the back side of that plate. Its a motorola 35a 3 wire. Do they still make those? What can a replace it with? Should i get
It rebuilt?

[HaulsBalls]

What about alternators? I spun the + post on mine and broke a little diode thing on the back side of that plate. Its a motorola 35a 3 wire. Do they still make those? What can a replace it with? Should i get
It rebuilt?

You can get one of those from just about any auto parts store, just take that one with you to match it up.  Is it a marine alternator?  I have a 3-wire in mine but it's wired to work like a 1-wire and I think it was about $40.  Since you are running and open engine most auto parts will work but keep in mind that a sealed compartment will require marine grade components.

Here's the mock up of mine.

[Bunger]

The one i have is a marine but my motor isnt covered. So i can run just about any alternator i want? Amperage doesnt matter? I plan on pitting a stereo in it over winter. What does a 3 wire do that a 1 wire doesnt?

[tamsone6]

I used to have a one wire on mine, after start I'd have to run the throttle up to 2000rpm or so to excite it which was kind of annoying. It also didn't work very well and I ended up with low voltage at the battery quite often. I switched it out for a three wire gm alt off a late 70's model truck. Cost me $15 at the junk yard rather than $100 for the 1 wire. The 3 wire allows you set up a low voltage light if you want as well and it automatically excites itself when you turn the key to on. Wiring it in is really easy as well.

[Bunger]

Does anyone know what car i can tell the autozone dorks to look up to get something that will work for me? If i use a 1 wire i just get rid of the wire going from the yellow exciter wire back to my purple ignition wire at my ballast resistor

[tamsone6]

77 Chevy c10, 350 will get you a three wire.

My one wire was just wired right to the battery through a circuit breaker.


Life is uncertain. Don't sip.

[Bunger]

So a 3 wire is what I have correct? One 10gauge wire from post to starter then one wire coming out of the alternator going to the purple ignition wiring?

[tamsone6]

It sounds like it.


Life is uncertain. Don't sip.

[Bunger]

I just talked to a guy at gsmarine and he said that people have back feed problems using automotive alternators on boats and it lets the motor keep running after you shut the key off?

[tamsone6]

I heard that too. I soldered in a diode on mine and it seems to work fine. I've never had my batteries die either however I do disconnect mine when I store the boat. I drew up a quick diagram of how mine is set up. Got the diode at radio shack for like a buck. Part number 276-1661.


Life is uncertain. Don't sip.

[Bunger]

Hmm startin to think im better off spending 140$ on a marine specific one.

[Bunger]

In your diagram isnt the #2 wire just for the charging dummy light and doesnt need to be connected?

[Bunger]

In your diagram isnt the #2 wire just for the charging dummy light and doesnt need to be connected?

[tamsone6]

It's the voltage sensing wire. Lots of people just jump it to the back of the alternator. That however creates the problem I was talking about earlier with the voltage drop.


Life is uncertain. Don't sip.

[Bunger]

Ok well i guess ill try the chevy c10 alternator. Sorry aboit all the questions but i cant even get a straight answer from the boat shops about which one to run so im baffled haha

[tamsone6]

Haha no problem, if you want I can send you some pictures of my set up later.


Life is uncertain. Don't sip.

[Bunger]

Ok well i guess ill try the chevy c10 alternator. Sorry aboit all the questions but i cant even get a straight answer from the boat shops about which one to run so im baffled haha

[Bunger]

Shit idk why my phone keeps posting everything twice

[Bunger]

Ok got myself the c10 alternated just not and now I'm baffled as to how to wire it up.

Here's the old one then the new one

[tamsone6]

It looks like the old one is set up close to the same way. Post on the back goes to the battery. Find out which wire is the switched 12v on the old set up.


Life is uncertain. Don't sip.

[Bunger]

The yellow wire is connected to my purple ign wire at the ballast resistor

[Bunger]

The yellow wire is connected to my purple ign wire at the ballast resistor

[Bunger]

Alright I think I've got it dialed. Pin F1 is the exciter wire took that to purple ignition wire on terminal block and R2 is the battery voltage sensor and took that back to red hot wire on terminal block. I guess the idea with that wire is to get it as close to the battery as possible to pick up the voltage drop. Still trying to figure out if I need that diode or if there's one possibly built into the alternator. Don't understand how the alternator would keep the motor running once the ignition is off.