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<!-- google_ad_section_start -->Changing a Fiat Punto 1.2 8v Mk2 Alternator<!-- google_ad_section_end -->
Changing a Fiat Punto 1.2 8v Mk2 Alternator
Published by Ziggy122
25-10-2011
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what does the Alternator Look Like?


Simple like this
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Mine is a 2nd hand replacement from a Local Scrap yard - So as you can see they simple cut the wires off

There are also 2 Bolt holes
And 1 Slider Hole
the Slider and the Bolt hole that are level with each other use a Simple Bolt to attach
the Bolt hole that is set back uses a Nut and Bolt


On the Back 2 wires
the thick Red One is the Feed and from the battery
And the black I believe is an earth? Iím not sure but either way

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Old 30-09-2012   #1
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Cool Alternator CAN BE REPAIRED! Don't replace it!

Quote Originally Posted by Ziggy122 View Post
And watch the voltage

With the engine off Battery voltage should be around
12.3 to 12.7
engine Running - 13.6v to 14v
1) Good battery should have at least 12,6 volts (12,5 and less requires proper charging and after that checking electrolyte density - most important parameter).
If density is not correct, you can easily recover battery by replacing electrolyte (and making desulphurization procedure if needed).
Of course, to do this, you should use classic, serviceable battery, not modern, so called "non-service" type (which main purpose is, to make you buy new one, and make you think, that most things are "impossible" to fix).
In most cases there is no need to buy new battery if it's "bad". Check also current consumption at engine switched off (much more than 30-50 mA will be cause of draining out battery).

2) Alternators (voltage regulators inside) have temperature-dependent characteristics!
Reason for that is to enforce proper charging process in winter time and avoid boiling out battery electrolyte when it's hot.
Example (sorry, it's not in english, but I think, clear enough to understand).

So, mind the temperature of alternator before you judge voltage level as "good" or "bad".

3) Wonder why you guys, almost always (on forums like that) forcing people to replace entire things like starters and alternators, while these are reparable devices!
Most problems with alternators rely on voltage regulator and/or bearings. Maybe diodes (bridge) sometimes fails.

Voltage regulator - quick and easy to replace (no special tools needed).


Bridge (you may need soldering gun to replace it - depend on alternator model).

Bearings may be Pain In The A... if you try to do this first time in your life (and don't even have basic tools like bearings puller), and you have "substitute" instead of original Bosch or Magneti-Marelli alternator (because there will be problem with purchasing correct bearings - proper clearances/fitting - like in this example, again, not in english: fiatpunto.com.pl/topic37324.html - but "a picture is worth a thousand words").

So, it can be successfully repaired (try not to do "shortcuts"/"cut corners" like that - by replace whole thing).
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Last edited by pmx007pl; 30-09-2012 at 15:43. Reason: Mistakes (english is not my native lenguage)...
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Old 30-09-2012   #2
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Re: Alternator CAN BE REPAIRED! Don't replace it!

Quote Originally Posted by pmx007pl View Post
1) Wonder why you guys, almost always (on forums like that) forcing people to replace entire things like starters and alternators, while these are reparable devices!
Most problems with alternators rely on voltage regulator and/or bearings. Maybe diodes (bridge) sometimes fails.
We used to repair starters/alternators but these days pattern starters/alternators are so cheap it doesn't make economic sense to repair. Also people want their cars fixed now and don't want to be off the road so won't wait until parts are sourced.
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