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1. [TR] alternator problem 74 TR6 (score: 1): Author: "Keith Ehrlich" <kehrlich@syntapharma.com>; Date: Sun, 15 Oct 2006 18:09:13 -0400; Yesterday the ignition light suddenly went on while driving and the voltage guage reading 11+ . I thought the alternator was shot, though it was only about 500 miles/1 year old. I drove about a mile; /html/triumphs/2006-10/msg00386.html (8,816 bytes)
2. Re: [TR] alternator problem 74 TR6 (score: 1): Author: "Graham Stretch" <technical-iwnet@onwight.net>; Date: Sun, 15 Oct 2006 23:31:24 +0100; Supposed to be very bad for an alternator to run without a battery, it senses a black hole to try to charge or something like that. I drove my Herald for over an hour, maybe nearer two with headlight; /html/triumphs/2006-10/msg00391.html (8,816 bytes)
3. Re: [TR] alternator problem 74 TR6 (score: 1): Author: Dave1massey@cs.com; Date: Sun, 15 Oct 2006 18:26:16 EDT; Idling the car draws very little power from the battery. Even driving draws very little. The ignition system draws about one amp. The battery, if fully charged, will support that load all day and all; /html/triumphs/2006-10/msg00392.html (10,360 bytes)
4. Re: [TR] alternator problem 74 TR6 (score: 1): Author: Dave1massey@cs.com; Date: Mon, 16 Oct 2006 08:26:34 EDT; The battery acts like a big capacitor. It will stabilize the voltage in the system which is especially critical when loads are switching on and off. The voltage spikes can cause collateral damage. Bu; /html/triumphs/2006-10/msg00402.html (7,601 bytes)
5. RE: [TR] alternator problem 74 TR6 (score: 1): Author: "Ann and Tim Buja" <buja@insightbb.com>; Date: Tue, 17 Oct 2006 17:48:40 -0500; Three terminal alternators have one small and two large Lucar male spade connectors. The small connector is the IGN lamp lead to excite the regulator on startup. One of the large connectors is the o; /html/triumphs/2006-10/msg00443.html (8,372 bytes)
6. Re: [TR] alternator problem 74 TR6 (score: 1): Author: "Graham Stretch" <technical-iwnet@onwight.net>; Date: Tue, 17 Oct 2006 00:13:53 +0100; Thanks for that info Dave, I hate to be the person dishing out misinformation, I was however repeating what I was told at college, I just could not remember the reason given, I guess I assumed that a; /html/triumphs/2006-10/msg00462.html (9,749 bytes)
7. Re: [TR] alternator problem 74 TR6 (score: 1): Author: Dave1massey@cs.com; Date: Wed, 18 Oct 2006 08:56:18 EDT; Cheers, mate! Dave == This list supported in part by The Vintage Triumph Register == http://www.vtr.org; /html/triumphs/2006-10/msg00471.html (8,159 bytes)
8. RE: [TR] alternator problem 74 TR6 (score: 1): Author: "Randall" <tr3driver@comcast.net>; Date: Wed, 18 Oct 2006 13:54:52 -0700; Unless of course the voltage spikes go high enough to ruin the diodes, or the regulator. BTDT ... won't run an alternator without a battery again. BTW, when it fries the regulator, the voltage can p; /html/triumphs/2006-10/msg00482.html (8,546 bytes)
9. Re: [TR] alternator problem 74 TR6 (score: 1): Author: Dave1massey@cs.com; Date: Wed, 18 Oct 2006 19:20:41 EDT; Indeed, running the system with the battery disconnected is a recipe for disaster. But the question was running the alternator disconnected from the rest of the electrical system. Without the load ap; /html/triumphs/2006-10/msg00484.html (8,867 bytes)
10. RE: [TR] alternator problem 74 TR6 (score: 1): Author: "Randall" <tr3driver@comcast.net>; Date: Wed, 18 Oct 2006 16:46:35 -0700; The OP said he measured the output at 17 volts. That says it was generating, which means the regulator was supplying rotor current. Alternator regulators are switch-mode devices, meaning it supplies; /html/triumphs/2006-10/msg00488.html (9,075 bytes)
11. Re: [TR] alternator problem 74 TR6 (score: 1): Author: Dave1massey@cs.com; Date: Thu, 19 Oct 2006 08:47:17 EDT; Are you sure about that switchmode of operation. I initially assumed it was switchmode because all my years of designing regulators for large AC generators were switchmode (or phase controlled rectif; /html/triumphs/2006-10/msg00505.html (10,587 bytes)
12. RE: [TR] alternator problem 74 TR6 (score: 1): Author: "Randall" <tr3driver@comcast.net>; Date: Thu, 19 Oct 2006 07:39:40 -0700; It can be hard to tell the difference just looking at the circuit. But think of it this way, the rotor resistance is less than 2 ohms ... how much power would the regulator dissipate if it were a li; /html/triumphs/2006-10/msg00511.html (10,330 bytes)
13. RE: [TR] alternator problem 74 TR6 (score: 1): Author: "John Herrera" <jrherrera90@hotmail.com>; Date: Thu, 19 Oct 2006 12:07:44 -0400; I used to teach Aircraft Electrical Systems. Every textbook, manual, pamphlet, video tape filmstrip, etc. I used as a resource warned against running an alternator without a battery or mentally-chal; /html/triumphs/2006-10/msg00517.html (8,625 bytes)
14. RE: [TR] alternator problem 74 TR6 (score: 1): Author: "Ann and Tim Buja" <buja@insightbb.com>; Date: Thu, 19 Oct 2006 14:50:43 -0500; I think it has something to do with the open circuit voltage you will develop without a battery connected that could result in overvoltage damage to the rectifier diodes. Remember the bronze tinted F; /html/triumphs/2006-10/msg00527.html (10,121 bytes)
15. RE: [TR] alternator problem 74 TR6 (score: 1): Author: "Randall" <tr3driver@comcast.net>; Date: Thu, 19 Oct 2006 16:58:55 -0700; replace under None at all if they can claim the damage was due to abuse. Running with no load is defined as abuse. Randall == This list supported in part by The Vintage Triumph Register == http://ww; /html/triumphs/2006-10/msg00546.html (7,929 bytes)
16. Re: [TR] alternator problem 74 TR6 (score: 1): Author: ZinkZ10C@aol.com; Date: Fri, 20 Oct 2006 13:05:18 EDT; << I think it has something to do with the open circuit voltage you will develop without a battery connected that could result in overvoltage damage to the rectifier diodes. >> That and voltage regul; /html/triumphs/2006-10/msg00571.html (8,106 bytes)

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