Alternator

[dan6499]

Yes I have a 1991 Blue Water Astro it has a 4.3 V6 Mercruiser in it can someone tell me Im all new to the boating world But I have been a Mec. for 25 plus yrs now the Alternator on this boat has one wire comming off of it ok now a 4.3 that is a chevy motor on a truck you have 4 wires batt. ground,an the plug that has 2 wires that you plug into the Alt. is the boat the same as the truck 4.3 the wires in the boat are there but the ground an the plug that has 2 wires is not hookup is this right I dont undersand why its not hook up my volt meter on the dash works ok I just need someone who know more about this than I do
Thank you so very much
the new boater

 

[br0]

Re: Alternator

I have a 1991 Blue Water Astro.
It has a 4.3 V6 Mercruiser in it.
The alternator on this boat has one wire coming off of it.
With a Chevy 4.3 motor on a truck you have 4 wires:
1) battery,
2) ground,
3) and the plug that has 2 wires that you plug into the alternator.

Is the boat the same as the truck? The wires in the boat are there but the ground and the plug that has 2 wires is not hooked up. Is this right? I dont undersand why its not hooked up.

My volt meter on the dash works ok, I just need someone who know more about this than I do.

Thank you so very much
the new boater

Probably get more replies this way...

And yes, the same wires should be hooked up.

 

[Don S]

Re: Alternator

Thanks for the punctuation br0, helps a lot.

Your alternator was probably replaced with an aftermarket Delco single wire alternator, not the OEM type. Mercruiser used the Mando, Motorola, or the Prestolite around that time. They used 3 wires plus a ground (4 total). You will probably find a purple (excite) and a red/purple (sense) wire taped off somewhere in the area of the alternator. Orange should go to the starter (main output) and black to ground.

 

[Bondo]

Re: Alternator

Thanks for the punctuation br0, helps a lot.

Your alternator was probably replaced with an aftermarket Delco single wire alternator, not the OEM type. Mercruiser used the Mando, Motorola, or the Prestolite around that time. They used 3 wires plus a ground (4 total). You will probably find a purple (excite) and a red/purple (sense) wire taped off somewhere in the area of the alternator. Orange should go to the starter (main output) and black to ground.

Ayuh,... Ditto that,...