twingo alternator not working

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paullap
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twingo alternator not working

Post by paullap »

Hi can anyone explain to me how a Renault Twingo alternator works and how to test it . it has the big Red wire to the stater, and the other wire from the plug goes to the Body Control Module. if I disconnect the plug should the alternator be charging, I have rad that this wire is an excite wire and it might need to activated to get the alternator working. if so how can I do it to see if the alternator is working.


Thanks


Paul
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white exec
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Re: twingo alternator not working

Post by white exec »

I'm sure someone will be able to help with this, and identify the small wire's function.
Just a word of caution: do not run the engine/alternator with either the battery or the alternator supply/sensing wire disconnected, as this can damage the alternator's electronics.
Chris
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Re: twingo alternator not working

Post by Hell Razor5543 »

Does the relevant light on the dashboard work? If this bulb fails, the exciter circuit may not work, as the bulb (assuming it is a light bulb) is a part of the circuit (not sure how it works of the light is an LED).
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white exec
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Posts: 7445
Joined: 21 Dec 2015, 12:46
Location: Sayalonga, Malaga, Spain
My Cars: 1996 XM 2.5TD Exclusive hatch RHD
1992 BX19D Millesime hatch LHD
previously 1989 BX19RD, 1998 ZX 1.9D auto, 2001 Xantia 1.8i auto
and lots of Rovers before that: 1935 Ten, 1947 Sixteen, 1960 P5 3-litre, 1966 P6 2000, 1972 P6 2000TC, and 1975 P6B 3500S
x 1752

Re: twingo alternator not working

Post by white exec »

Good point, James. Some are LED, some a filament bulb. Quite a few have a resistor in parallel with the bulb to cater for bulb failure.
Chris
paullap
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Joined: 18 Feb 2017, 06:46
Location: Berkshire
My Cars: Peugeot 206
x 6

Re: twingo alternator not working

Post by paullap »

Hi Thanks for the help, The bulb is working as it comes on after about 30 seconds. I have have 12.4 volts at the battery KOEO and engine running, no change,


Paul
paullap
Posts: 59
Joined: 18 Feb 2017, 06:46
Location: Berkshire
My Cars: Peugeot 206
x 6

Re: twingo alternator not working

Post by paullap »

I have just done a code scan and it has a DF137 UCH- Alternator connection, I dont have a clue what a UCH connection is. also I have put a scope on the exciter wire and has a square waveform very much like a can signal.


Paul
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