Hissing battery……

7173Mustangs.com

Help Support 7173Mustangs.com:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
72conv said:
Someone correct me if I'm wrong here, but doesn't the alternator require field excitation to generate voltage? In other words, with the field disconnected, there would be no output?

Billw69, you mentioned that you have another alternator on hand and you were going to try it. How did that work out?
Click to expand...
You re correct, the field needs current flowing through its wiring/coils inside the alternator to work. The reason for pulling the field terminal is to see if the alternator continue to put out voltage higher than battery voltage. If it does it means there is a short somewhere inside the alternator that is allowing the field circuit to be getting current when it ought not be getting current. Just one of several diagnostic approaches to determining where the field voltage is coming from.
 
mrgmhale said:
You re correct, the field needs current flowing through its wiring/coils inside the alternator to work. The reason for pulling the field terminal is to see if the alternator continue to put out voltage higher than battery voltage. If it does it means there is a short somewhere inside the alternator that is allowing the field circuit to be getting current when it ought not be getting current. Just one of several diagnostic approaches to determining where the field voltage is coming from.
Click to expand...
Where in Minnesota are you located? I ask because this coming week we are going to be in Minneapolis for a friend's 90th birthday and 60th anniversary celebration. If you are anywhere nearby I may be able to bring some equipment to help check things out.
 
We’re located in Cannon Falls, however I leave for Oshkosh Wi. Tomorrow and would return home later next week. What a generous offer! I wouldn’t plan on bringing gear just yet. I’m still focusing on the possibility of a failed VR, seems to make the most sense, it won’t get to try a different one until later this week.
Where are you visiting in Mn?

thanks again, for all your help.
Bill
 

Similar threads

73inNH
Hunting a voltage leak
2
Replies
26
Views
2K
73inNH
73inNH
SalmonTex
Help Locating a Dead Short
Replies
15
Views
1K
mjlan
mjlan
Austin Vert
AUSTIN VERT'S NEW REVERSE CAMERA PROJECT
Replies
14
Views
785
TheDude
TheDude
Steve McMahan
1973 Convertible Project
Replies
12
Views
401
Steve McMahan
Steve McMahan
Moderator73
Any Ideas what this electrical item is & might be for?
Replies
13
Views
2K
71coop
71coop

Latest posts

Back
Top