Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-02-2019, 06:54 PM   #21
Member
 
City: Perth
Country: Australia
Join Date: Feb 2019
Posts: 12
Quote:
Originally Posted by Ski in NC View Post
When alarm comes in, go around engine and alt and batts with a voltmeter and see what the readings are. Normal is 13.8-14.2Vdc.
Will do
__________________
Advertisement

caltexvb is offline   Reply With Quote
Old 03-03-2019, 08:29 AM   #22
Guru
 
twistedtree's Avatar
 
City: Gloucester, MA
Country: USA
Join Date: Jan 2013
Posts: 5,762
OK, I missed that the alarm goes away after some time.


And you said the alternator is two wire only, so + and - going to the battery, and nothing else, right. That means it's a completely self-contained regulator with automatic on/off switching.


I'll bet this is all really very simple. The new alternator just has a longer delay before it turns on, yet the engine alarms are expecting to see a voltage increase right away, or very quickly after starting. In time, the new alternator turns on, starts charging, voltages rise, and the alarm goes away.


David's suggestion of putting a meter on and watching the voltage from start up until the alarm goes away will confirm or deny the theory.


If the theory pans out, then you can either ignore the alarm, or see about changing the alternator or regulator to something that comes on right away, or is controlled by the ignition switch.
__________________

__________________
MVTanglewood.com
twistedtree is offline   Reply With Quote
Old 03-03-2019, 11:04 AM   #23
Guru
 
koliver's Avatar
 
City: Saltspring Island
Country: BC, canada
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 3,576
Not a Cummins owner, but I have an alarm that is wired to both low oil pressure and high coolant temp. At start, it comes on with the key, they goes off with rising oil pressure. sometimes that takes a few seconds. likewise, the alternator senses oil pressure rising and waits to engage the secondary coils till that has occurred. Could yours be the same?
__________________

__________________
Keith
koliver is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 04:04 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×