AMGBA website home page or AMGBA Photo Gallery or AMGBA Club Blog
Subscribe in a reader


Join or renew today and receive a free t-shirt or tech CD, see details in the join the club section at www.mgclub.org!

Author Topic: Alternator Replacement  (Read 111 times)

0 Members and 1 Guest are viewing this topic.

march2021

  • An AMGBA Club Member
  • ***
  • Posts: 28
Alternator Replacement
« on: February 14, 2021, 12:57:27 PM »
Can I replace the standard alternator on my '73 B with a new 18ACR without any modifications? Cheers
Dave Hornby

JohnTwist

  • AMGBA Club Tech Staff
  • ****
  • Posts: 107
    • University Motors
Re: Alternator Replacement
« Reply #1 on: February 14, 2021, 01:06:54 PM »
The 1968 MGB uses a 15AC alternator with an external 4TR regulator.  Following that are 15 ACR (internal regulator), 16ACR, and finally an 18 ACR.  They are all interchangeable, EXCEPT for the plug variety.  There are two varieties of the three wire plugs:  narrow-wide-wide and narrow-extra wide-narrow.  Of course, you can change the spade terminal configuration by soldering different sized spades onto the wires.  The outside wire is BROWN/YELLOW, the center wire is the heavy gauge BROWN, and the inside wire is a sensing/feeder also BROWN.

Some owners have adapted a Saturn alternator which can produce 100 amps (you do NOT need 100 amps and even if you did, the wiring cannot handle it).

Hope this helps!

SAFETY FAST!
John H Twist
University Motors Online
www.universitymotorsltd.com
SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids, MI  49506

616-307-6737
johntwist@universitymotorsltd.com
www.universitymotorsltd.com

If you have found my technical advice helpful, please consider making a contribution to help defray my online expenses.  Go to my website and click the PayPal button: www.universitymotorsltd.com.


 

   AMGBA website home page or AMGBA Photo Gallery or AMGBA Club Blog