Absolutely Not! If using a test bulb neither end should be grounded.
The charging circuit has 2 components:
- The big wire runs (indirectly) from the pos battery terminal to the big B+ lug on the alternator.
- The warning/indicator light circuit runs from the male bayonet connector on the
alternator to the indicator bulb in the dashboard instrument cluster. Then from
the other side of this bulb back to the POSITIVE terminal of the battery. Well not
exactly: In the case of the 405 the current gets to the bulb from fuse 10.
I don't know what fuse is the "charging fuse" on the 505 but there is one that is for sure
What is happening is that when there is more juice coming out of the battery
the indicator bulb is grounded inside the alternator. When the alternator is putting out more juice
than the car is using the ground is interrupted and the bulb goes out.
If you want to run a dirct test bypassing the ind circuit in the dash..Take a samll bulb with tails
connect one to the bayonet connector and one to the pos terminal of the bayttery or even just the
B+ lug on the alternator.
- Original Message -----
From: kenneth parker
To: (Phil)
Cc: 'Peugeot List'
Sent: Sunday, March 06, 2005 12:08 AM
Subject: Re: [Peugeot-L] another unsolved mystery
Phil,
Before I do anything stupid (my strong suit) let me make sure that I
understand what you are saying.
- If I hook a test lead, with one end of the alligator clip grounded
and touch the other end of the lead to the small push-on wire on the
alternator with the ignition turned on the light should light up
(assuming that it is not the bulb or wiring leafing to the bulb)?
- If, when the engine is running, I hook up a test lead to the
battery + terminal and momentarily touch it to the same little wire
than, if the alternator is good it should start charging? Is this what
is referred to as "energizing the field?"
Thanks,
Ken
On Mar 4, 2005, at 4:26 PM, (Phil) wrote:
> The light HAS to be on before start. If it is not, the alternator
> will never start charging. Believe it or not, a burnt-out light bulb
> will actually break the charging system.
>
> If you ground the "little wire" the normally connects to the
> alternator, you should get a light when the ignition is on. If not
> then it's the bulb or wiring/fuses to the bulb. If you DO, then it's
> a fault in the alternator. (Bad brushes will do this) There is also a
> relay in the fusebox that may feed power to this light (I cant
> remember for sure).
>
> In a pinch you can use a test lead and momentarily supply +12v to this
> small wire when the engine is running. This should start the
> alternator charging if it is good. DO NOT leave it connected for more
> than an instant though, unless you limit current. (A 12v lightbulb
> makes a fine limiter ;-)
>
> BTW: If my guess is correct, you have not seen the last of your
> Tachymetric relay problems. If you overheat a connector in a
> high-current circuit, you almost always will have a failure if you do
> not repair it.
>
> -Phil
> ----- Original Message ----- From: "kenneth parker" <elkeni@mac.com>
> To: "'Peugeot List'" <peugeot-l@yahoogroups.com>
> Sent: Friday, March 04, 2005 4:16 PM
> Subject: [Peugeot-L] another unsolved mystery
>
>
>>
>> After installing the tachymetric relay that I got, used, from a friend
>> near my house I tested the car and it worked fine. I arrived home
>> with
>> a feeling of satisfaction and buttoned up the under-the-steering-wheel
>> plastic. Everything seemed to check out and I was all set to set out
>> to Los Gatos (60 miles from my home) where I work on Fridays as a
>> guitarist.
>>
>> Just before loading up my car I started it one more time and noticed
>> that the battery light did not illuminate when I put the key in the
>> "on" position. I thought that the small wire to the alternator might
>> have disconnected. I checked it and it was fine as were the other two
>> wires and the wire to the plastic (maybe a resistor of some kind) on
>> the opposite side of the alternator.
>>
>> I tested the voltage across the battery and got 12.5, with or without
>> acceleration. I got the same stat from the terminal at the rear of
>> the
>> alternator.
>>
>> My questions with regard to this latest curve thrown my way are:
>>
>> 1. What might have disconnected that is accounting for the system
>> not charging? and,
>> 2. In the past when the system isn't charging the battery light
>> would flicker. How come there is no battery light illuminating in the
>> instrument cluster?
>>
>> 3. Might I have undid something when I installed the relay and the
>> plastic under the steering wheel?
>> Thanks and sorry for the onslaught of mysteries,
>> Ken
>>
>>
>>
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Received on Sun Mar 6 09:07:58 2005
