205 XUD 7 Alternator or battery duff ?.

[makemine205]

Peugeot 205 xud 7
I have to check out the alternator system , trying to locate the alternator fuse , just where is the fuse , in the fuse tray or engine bay ?
Battery is very low , when i removed the positive terminal from the battery and engine running the engine cut out so seems like the alternator is duff or blown fuse .
Can anyone help please.

[RichardW]

You need a voltmeter, check voltage engine running, should be over 14v

[makemine205]

Checked it , never budged on rev up it stayed at just under 12v

[MattBLancs]

If you can get access reasonably well and I think alternator is on the front on the XUD, would be worth reading at the 13mm nut on the alternator, see what what is reading there.

Not sure what fuses if any there are on the charging circuit? Perhaps the exciter wire runs through a fuse but don't think the alternator output would do?? Sorry I don't have a 205 Haynes to check the diagrams

[CitroJim]

Does the ignition warning lamp light when the ignition is turned on but the engine not running? Does it go out when engine is running?

I ask as often the ignition warning lamp circuit supplies the excitation voltage to the alternator and if this is absent you'll get no charging output from the alternator.

Often the problem is a break in the thin wire going to the alternator - often at the terminal on the alternator itself...

Or a blown ignition warning light bulb...

[makemine205]

The ign light comes on but gets dimmer , jump starts ok , but when engine speed increased the light doesn't go out just stays on but a bit dimmer than full brightness and flickers a bit. The head lights get dimmer whilst driving , so must be not charging.
Will check the alternator then.

[ozvtr]

There are typically 2 faults that stop an alternator working.
1) the regulator. This goes faulty or just stops working (properly). (I had a faulty regulator that caused the alternator to put out over 15V).
2) the carbon brushes wear down and don't make contact with the rotor slip rings.

Other problems can be: worn grooves in the rotor slip rings. Faulty diode(s) in the diode pack.

Of all the faults that could happen, worn brushes is the most likely.
FYI a new regulator usually comes with a new set of brushes installed. Also you can obtain new brushes and solder them to the old regulator.

[moizeau]

On an XUD7 the alternator is at the front rhs. Not seen the access on a 205 but on a BX, with all the hydraulic pipes, the regulator/brushes unit (all in one) is screwed in with 2 (I think) phillips screws. For the price of around 20€ this can be replaced in situ in about 5 mins, this timing includes lifting the bonnet.
Just to confirm this, as already stated, fully charge the battery, confirm it has at least 12.5v then start the car. With your multimeter wires on the positive output on the alternator and the negative on the alternator body, with the engine above 2500 rpms you should see 14 odd volts.

[makemine205]

Thanks for replies
Its coming off then , look like either new brushes or a re build unit , the battery is holding a charge overnight .
Ta very much for help

[moizeau]

You don't need to take it off, just the brush/regulator unit.

[makemine205]

Thanks for that Moizeau

[makemine205]

I have decided to take off the alternator as its never been off and need to change the belt too, a clean up in that area wont hurt either, i had to remove the tensioner assembly too, its almost free BUT the large swivel bolt at the bottom is stopping its removal, it looks like it can be removed as there is a slot in the aluminium alternator housing lug so it can pass over the large bolt, how on earth
do you remove that large bolt to free the alternator ???. The large bolt wont go any further as it butts up against the body frame .

[MattBLancs]

I think it might be a case of jack and piece of wood under sump, upper engine mount off and the drop engine down so bolt clears the chassis rail.

Bear in mind this is from memory of an XUD9TE in a 306 I had about 15 years ago! But do remember that gap from auxiliary belt to the chassis was tiny (less than width of the belt itself)

I also remember there was a right and wrong way to route the belt, the wrong way is very, very close to the belt going on! Thought I was loosing my marbles when trying to put it on the wrong way, wound tensioner in as far as it would go, but just needed another tiny little bit of play to get it on!

[moizeau]

Straight out of the 1.7/1.9 Peugeot/Talbot Bol's

[moizeau]

Missed a bit of the tensioner photo