97 Bayliner 4.3 Electrical Troubles!

[doman]

Hello
I have recently picked up a 97 Bayliner with 4.3 V-6 Engine ..Im trying to figure out some wireing nightmaress here..there was a lot of splicing and what not going on the engine wireing harness ... Engine has Electronic Ignition with thunderbolt IV module on the back of the distributor ....Here is what im haveing problems with....
Oil pressure cutoff switch connection ..since there is no ecm in the boat i dont undersatnd how it is suppuse to work ..looking at the manual wire from the oil pressure cuttof switch runs to the electric fuel pump...but it wont since there is no pressure when the engine is not running ....so what should i do about the switch just take it out? Im not sure if the boat had a different setup before or not but it is carburated now has electric fuel pump and electronic ignition...
The other problem is Shift cutout switch .....has two connections one ground and the other one according to the manual should go to one of the wires comming out form the distributor (white/green) and white/ green is already connected to the module on the back of the distributor along with white/red...Do i splice in to the white/green comming from the distributor or am i missing somethiing here

Any help would be really appreciated !!!

 

[180shabah]

Re: 97 Bayliner 4.3 Electrical Troubles!

Your boat originally had BOTH electronic ignition AND an electric fuel pump.

DO NOT remove the oil pressure switch. The fuel pump gets power from TWO sources. There is a stud on the starter that is powered while starting, then when you release the key power comes from the oil pressure switch.

Which manual are you using? The REAL merc manuals are available in the adults only section.

 

[180shabah]

Re: 97 Bayliner 4.3 Electrical Troubles!

Are you saying that the white/green is attached to a white/red????

The white green from the distributor should be connected to the grey wire on the shift interrupt switch.

 

[Don S]

Re: 97 Bayliner 4.3 Electrical Troubles!

If you have the TB IV ignition, then you should have a white green wire on one of the 2 screws out of the distutor and go directly to the shift interrupt switch. DO NOT go splicing wires. That is not how it's done.
Besides, I can't see a 97 engine being a TB IV, do you have a Merc serial number handy for your engine.?

 

[doman]

Re: 97 Bayliner 4.3 Electrical Troubles!

Thanks now i see how the oil pressure cutoff switch works ... however im still not sure about the distributor wireing to the shift cutout switch

I have three wires comming out of the distributor green/white red/white and black

There is also green/white red/white comming out of the ignition module on the back of the distributor and i have them connected to the corresponding wires on the distributor so that leaves me with no additional green/white on the distributor to connect to the shift cutout switch unless i connect it to the green/white that is laready connected to the ignition module ....

like i said someone has already messed with it before i dont think this was TB IV before but it is now

So im just confused about that shift cutout switch

 

[Don S]

Re: 97 Bayliner 4.3 Electrical Troubles!

Post some picures.
If thing has be backyarded, it may be almost impossible to explain without seeing what you have. The most obvious problems to a trained eye, won't be seen by you describing what you see, especially if you miss the real problem.

 

[doman]

Re: 97 Bayliner 4.3 Electrical Troubles!

how many wires should i have going in the distributor from the ignition module? and what are they if anyone know (color) and what wires should i have on the ignition module and where do they go maybe this way i can figure out where the problem is

i will take some pics tomorrow of what i have

 

[Don S]

Re: 97 Bayliner 4.3 Electrical Troubles!

Here is the OEM service manual. It has all the wiring diagrams in it. Along with a complete section on each distributor and it's wiring.

http://www.4shared.com/document/TcnPb3wU/Service_Manual_18.html