Yesterday's Tractor Co.
Shop Now View Cart
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
John Deere Tractors Discussion Forum
Show Parts for Model:

Re: 2150 alternator needs to see 1500 RPM before starts charging

[Show Entire Topic]  

Welcome Guest, Log in or Register
Author  [Modern View]
Lee B

09-01-2013 05:22:40

Report to Moderator

Idiot light circuits like the one you have typically have one bulb and one resistor in parallel to it supplying exciting current to the alternator in order for it's field to generate enough magnetic flux to generate it's own field flux. This results in the light going out since it is no longer supplying enough current to light the bulb.

If your resistor burnt out or was never hooked up you would have exactly the situation you describe, and the fix is certainly a simple one. Just add another bulb in parallel to the one you already have and the additional current supplied by it will cause your alternator to start charging as soon as the engine starts. I prefer to use sealed trailer clearance lights because they are just the right size and can be had for cheap. You can just wire it up to the two wires that are going to your current idiot light and leave it under the dash.

Whenever I add an alternator to a system that didn't have one before I use a standard Delco SI-12 55 amp with two clearance lamps (wired parallel) between the ignition switch and terminal 1, terminal 2 gets wired to the output directly so it's hot all the time. Your Bosch complicates that picture a little but not from the standpoint of the existing idiot light, just double up on it and you've done the same thing.

It's really that easy. The parts store will have splicing couplers that allow for easy hooking up to your existing idiot light wires and the added trailer light socket with bulb. If it don't work you can cut it off easy enough, either way a half hour with the right parts and you are done.

It is NOT good to have to rev an engine to get an alternator to start charging, it creates an incredible voltage and current spike to match that will over time take out the voltage regulator and cause the alternator to charge at full output until it burns out itself. One bulb systems do this constantly and after a couple years of spikes, I had to put in another bulb, and regulator, I've been a two bulber ever since. No more problems with spikes or pegged ammeters going taaawaannggg!

[Log in to Reply]   [No Email]
[Show Entire Topic]     [Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums

Copyright © 1997-2016 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters