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charging problem, golf mk4 1.6?

charging problem, golf mk4 1.6?

Author
Discussion

jellyhashman

Original Poster:

10 posts

3 months

Friday 18th August
quotequote all
When I start the car I get 13.8-14v but soon after drops off to battery voltage and the battery just drains. Is it time for a new alternator?

GreenV8S

24,636 posts

205 months

Friday 18th August
quotequote all
jellyhashman said:
Is it time for a new alternator?
Does seem like it. It's common to exchange/recondition them rather than buy new. Quite likely it only needs a new electronic module, but while they're repairing it they will probably want to fully recondition it.

E-bmw

2,816 posts

73 months

Friday 18th August
quotequote all
jellyhashman said:
When I start the car I get 13.8-14v but soon after drops off to battery voltage and the battery just drains. Is it time for a new alternator?
Just to be sure you do mean that the alternator output to the battery drops while the engine is still running?

it is just that you don't actually say the engine is still running when the voltage drops.

jellyhashman

Original Poster:

10 posts

3 months

Friday 18th August
quotequote all
Yes still running when voltage drops

E-bmw

2,816 posts

73 months

Friday 18th August
quotequote all
Alternator.

Assuming the belt is tight.
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jellyhashman

Original Poster:

10 posts

3 months

Friday 18th August
quotequote all
Thanks everyone

M32Guy

55 posts

10 months

Monday 21st August
quotequote all
There's a common issue on these with the wiring going to/from the alternator. Not sure exactly what it is or how to fix it but I'd get that checked out first before replacing the alternator. I'd expect the alternator to never charge the battery if it were indeed faulty but I could be wrong on the Volkswagens

jellyhashman

Original Poster:

10 posts

3 months

Wednesday 23rd August
quotequote all
Changed the alternator already, seems to have sorted it though now the ignition cuts out randomly. Hoping it's just the cheap chinese obd reader that's been plugged in when it's happened but probably not.

E-bmw

2,816 posts

73 months

Thursday 24th August
quotequote all
Check around the alternator to make sure when it was changed everything was reconnected securely.

jellyhashman

Original Poster:

10 posts

3 months

Thursday 24th August
quotequote all
I did, all was good. It's not happened again since not having the obd reader plugged in. Might be some bug in the software or dongle or it loses bluetooth connection re-connects and then cycles the relays and stuff on/off.

Classy6

168 posts

98 months

Tuesday 5th September
quotequote all
Take out the alternator fuse across the top of the battery, it's a strip fuse. Just make sure it hasn't cracked or blown.