Alternator swap
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=35709
Printed Date: September-27-2024 at 8:00am
Topic: Alternator swap
Posted By: Spievy79
Subject: Alternator swap
Date Posted: April-06-2015 at 2:02pm
Hello, I've been a member here for several years. I used to have a 68 mustang which I sold due to having a little one. Since then I went to a pontoon for a year, and that was enough! So I came across an 87 ski supreme Sierra ss with a cuddy cabin. It was a meet in the middle sort of thing with the mrs. So obviously I don't have a correct craft but I have nowhere to turn  . To make a long story as short as possible the boat was in awful shape when I bought it. Rotted furniture, carpet,floors,stringers etc. But the motor only had 530 hours so $1700 later I had a project on my hands. I tore it down to a shell, rebuilt all the stringers with a lot of reading on this site, new flooring,upholstery,teak and everything in between. I thought I had done pretty well until mid summer of last year out on the water we heard a knock knock on the water and after tearing down the motor discovered shrapnel on two Pistons that apparently came from the intake casting, one cracked head, and a 3 inch crack in the oil valley along a waster jacket  . I was able to find a good used pcm 351w out of an 87 supra with 450 hrs. $500 later I swapped the carb,distributor and a few other whatnots and got it in and running. When I bought the new (used) motor the top tab on the alternator was broken. The alternator is a Motorola 8rg2009a. I have a 3wire I believe delco from my parts motor which is an indmar btw that does work well. So my question is can that alternator work? Upon removing my broken tabbed one I had a yellow, orange and a ground coming off. My parts one had only one coming in and one coming out. I'm guessing it's internally regulated? I know that I could just buy new but I have two working alternators and I was hoping to be able to either fix my broken one or use the other if it's possible. I appreciate any and all knowledge anyone can give me on this. Thanks, Joel
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Replies:
Posted By: Spievy79
Date Posted: April-06-2015 at 2:06pm
| Btw I had to redo my account on here since I hadn't posted in so long. I've been a member on here since 2008. |
Posted By: Bri892001
Date Posted: April-12-2015 at 11:50am
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According to Tim's wiring diagram, a typical PCM alternator has 3 wires, an exciter, a ground and the output. Of course, this is assuming internally regulated. So, are they both 3 wire internally regulated alternators?  Here is an alternator wiring image that might also e helpful: 
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Posted By: Spievy79
Date Posted: April-14-2015 at 1:45am
I ended up just replacing the case and having it rebuilt, I've had enough heartache with everything already, it was worth $60 to not play any guessing games on it. I do appreciate the detailed pics though. As always you guys on here are always so helpful. 
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