The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Denso alternator - test/replace voltage regulator ? 900 1993

posted by  Schumi1 on  Mon Aug 13 13:15 CST 2012
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Thu Oct 16 09:52 CST 2014
[RELATED]

Hello All,

1993 940 b230f. 176,000 miles.
I had a 2 year old battery get strangely weak from 12.4 (engine off) to 13.5~8 (idle) but voltage drop to 13.1 with lights, fan, radio, etc. on at idle. Increase in RPM did not bring up voltage beyond 13.1 Anyway I figured I would start with a new battery and check/replace the brushes on the alternator first.
I got the replacement from J&N off the faq page. I suspect my brushes are worn but not completely dead..From what I've read, the Denso alternators are very robust compared to the Bosch ones and the bearings and diodes rarely have problems in these units.
Since I am working on it , is there a good way to diagnose the actual voltage regulator without taking the alternator to a tester ? (meaning on the car)
The faq page says its easy to replace the voltage regulator but then another tip on the faq says aftermarket voltage regulators can cause problems. The OEM voltage regulator is $200+ and the aftermarket is $40,
How do I know if my original one is functioning properly ? dimming lights, buzz in the radio, these don't seem to be very clear diagnosis..

Any help is appreciated





USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.