Alternator PCM controls? - TDR Roundtable

Alternator PCM controls?

04-14-2008, 03:17 AM

#1 (permalink)

"Mad Max"

Offline
Join Date: Oct 2002 Location: Peyton, CO Posts: 1,224 Photo Gallery Old Reader's Rigs Gallery

Alternator PCM controls?

We're installing a '93 6BT/518 combo in our Ramcharger, complete with the '93 engine wiring harness, and in the FSM is indicates the PCM is connected to part of the alternator's wiring, but we cannot figure out why.
There are 4 main terminals coming off the alternator: (A) 6BK/WT - engine ground, (B) A142 18DB auto shutdown relay, (C) - PCM (generator field???), and (D) alternator feed to battery.
Ground and main hot are no sweat, but what does the PCM feed do and while I'm at it what does the auto-shutdown relay do?
Can anyone educate us on what/why the PCM is in the alternator's wiring harness...and does it need to remain in the loop?
We had a 3-wire GM alternator in the RC before and now we're trying to figure out how to make the 6BT alternator play nice with the RC's wiring.
Any input is greatly appreciated.
- Sam

__________________
ASA Modifieds www.asamodifieds.com
* Now available: ASA 4" Downpipes *
'93 D250 Club/LE auto/3.54's, PDR HX-35/14(gated), PDR pin, ASA Intake & 4" Downpipe, PODs, ATS manifold, fuel max'd, 366 spring - dyno'd 308/620, DTT converter, MagHytec pan/diff cover, Autometer x6, column o/d...

Non members can only view the initial post on threads more than 7 days old. There are 19 additional replies on this thread that you could view if you were a member.

TDR Membership offers many benefits including:

4 issues of the TDR magazine per year including these columns:
- Tailgating - A Letter From The Editor
- Letter Exchange - Responses From The Readers
- Member2Member - Members' Solutions To Members' Questions
- Technical Topics - Service/Parts Update
- First Generation - Owner-Specific Articles On The '89 - '93 Dodge Diesel Trucks
- 12-Valve Engines - Owner-Specific Articles On The '94 - '98.5 12-Valve Dodge Diesel Trucks
- 24-Valve Engines - Owner-Specific Articles On The '98.5 - '02 24-Valve Dodge Diesel Trucks
- Third Generation - Owner-Specific Articles On The '03 And Newer Dodge Diesel Trucks
- Blowin' In The Wind - Industry News
- Shadetree - Back To The Basics
- Celebrity Corner - The Shadetree Mechanic - Sam Memmolo
- From The Shop Floor - Tips From Turbo Diesel Repair Shops
- Products Showcase - Featured Products
- TDRelease - Vendor Press Releases
In many areas of the country a local chapter with events
A yearly printed copy of the TDR Travel companion listing approximately 700 TDR members across the country willing to help you if you have trouble on the road
Complete access to the TDR website including:
- Ability to do advanced searches over 1.1 million posts
- Access to members only forums (Truck 911, FAQ Forums, Discontinued parts support, Rigs spotted, Pay it forward, Other, and Political)
- Posting ability to the forums
- Ability to read an unlimited number of posts from the forums
- Can customize your forum list to your interests
- Can choose 1st, 2nd, 3rd gen, or rotating header graphics
- Limit searches to forums your interested in
- View posts since you last logged on
- Private message ability to other members
- Chat room access
- Diesel truck specific TSB listing by model year
- Online access to the Travel Companion database (with most current information)