 Emergency Battery Disconnect Might Have Fried My Alternator, Even Though I Wired In The Resistor |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| motorvated |
 Feb 17 2016, 06:45 PM
Post
#1
|
|
Member  Group: Members Posts: 281 Joined: 13-February 13 From: Colorado Member No.: 15,519 Region Association: Rocky Mountains  |
'72 car with '75 1.8 L-Jet. Relay board has been removed and alternator is wired directly to voltage regulator. No wiring to alternator light in dash so I wired in a 12volt wire that is hot with the key to a small light in the engine compartment that is wired to the field windings of the alternator to serve as a boot strap to get the alternator to start charging. With the I gnition on, engine not running, the light is on. Crank the engine and the light goes off as it should. Got the motor running and the light stayed off. I hit the emergency shutoff switch that I wired in to test it and confirm that it stops the motor and cuts off all power, which it did. Next time I started the motor the light stayed on and no changing detected at the battery. So it looks like I might have fried my alternator by using the emergency shutoff switch. I wired the resistor that came with the shutoff switch on the downstream side of the shutoff switch as specified, and it was supposed to dump the residual current through the resistor to ground after the switch is moved to the off position and protect the alternator. Any comments or opinions on this. Did I do something wrong? Any tests I can do of the alternator to assess it's condition?
|
   |
 
|
  |
Replies
| stugray |
Feb 18 2016, 12:19 PM
Post
#2
|
|
Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
My master off switch has two separate poles.
One is for the main power (Batt+ to system pos terminal), and the other is for the Alternator charge circuit. When you open the switch it disconnects the battery from the entire system AND it disconnects the line from the alternator back to the battery. This is so that the alternator does not keep the engine running when you remove the battery from the circuit. Also, when I removed my relay board and wired the alt directly to the voltage regulator, I had to swap two pins in the connector and splice in the field bootstrap line (the one that goes to the dash light). Did you rewire the VR connector? Not sure if this helps, but more data. I can pull up diagrams of how I did it when I get home. |
|
|
|
| stownsen914 |
Feb 20 2016, 06:59 AM
Post
#3
|
|
Senior Member Group: Members Posts: 916 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
You have the right kind of cutoff switch? Like this (and wiring diagram)? You mention the resistor, but just checking ...
Attached image(s)  
|
|
|
|
Posts in this topic
motorvated Emergency Battery Disconnect Might Have Fried My Alternator Feb 17 2016, 06:45 PM
Cracker FWIW: I have an LS conversion and have never insta... Feb 18 2016, 07:31 AM
motorvated
You have the right kind of cutoff switch? Like th... Feb 27 2016, 08:13 AM
396
You have the right kind of cutoff switch? Like th... Mar 3 2016, 02:48 PM screenguy914 Alternator needs a load when running. Disconnectin... Feb 25 2016, 02:12 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 11th June 2024 - 11:46 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.