Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login

Site Notices
9/16/2019 10:09:13 PM
Posted: 6/16/2014 7:48:14 PM EDT
I have a 1989 34' Black Watch with twin 454 Crusaders. I broke off the stud for the "EXC" wire while changing the belt. The motor still cranks but have not taken her out for a spin. What does that wire go to? Is it needed? Also it is made by prestolite, who is no longer in buisness, what is an acceptable aftermarket replacment?
Link Posted: 6/16/2014 7:51:32 PM EDT
do you mean the exciter wire on the back of the ALt ??????
Link Posted: 6/16/2014 7:52:59 PM EDT
do you mean the exciter wire on the back of the ALt ??????
Link Posted: 6/16/2014 7:53:36 PM EDT
damn did it twice
Link Posted: 6/16/2014 7:53:46 PM EDT
Yup. Does it run to the coil? I
Link Posted: 6/16/2014 7:53:49 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By 45_nut:
do you mean the exciter wire on the back of the ALt ??????
View Quote


Link Posted: 6/16/2014 7:56:41 PM EDT
[Last Edit: 6/16/2014 7:58:05 PM EDT by Use_the_2nd]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By palmetto_gunplay:
Yup. Does it run to the coil? I
View Quote


It literally excites your alternator by giving it a little boost of electricity, it helps the alternator to start producing its full charging capability.

Edited
Link Posted: 6/16/2014 7:57:02 PM EDT
do you mean the exciter wire on the babk of the ALt ???
Link Posted: 6/16/2014 8:01:41 PM EDT
[Last Edit: 6/16/2014 8:12:30 PM EDT by 2506jet]
Take it off and bring to a rebuilder, they can fix it for about $35-50 including putting in new brushes and testing output. Or buy a new single wire (just need to hook up the large red or orange wire to the output stud. Any GM alternator will work, just make sure it is a proper marine config with the flame arrestor screens in it.

ETA check to see if the pulley diameter is the same with a replacement, you can swap over most but some have different shaft diameters/flats on them. The swing bolt boss and tensioner flange are all the same with the Delco/prestolite GM alternators used on GM based marine engines. For the most part)

Here is on on Amazon, a 110amp new for $65. It's a single wire. You may have to connect a keyed hot (purple color) wire to the choke coil to use this type. Link

Link Posted: 6/16/2014 8:04:28 PM EDT
do you mean the exciter wire on the babk of the ALt ???
Link Posted: 6/16/2014 8:46:11 PM EDT
Awesome guys, thanks for the replies! It hadn't even crossed my mind to have it rebuilt...
Link Posted: 6/17/2014 4:03:00 PM EDT
Hey guys thanks for the advice. Going with a rebuild, it was much cheaper and the stud will be replaced with a new voltage regulator. thanks for help will update when complete.
Top Top