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1989 G50 Turbo

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SteveJC
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SteveJC PCGB Member
2020/09/14 10:52:47 (permalink)

1989 G50 Turbo

I have had an issue with my rev counter needle bouncing around on a few occasions
A couple of weeks ago drove for about 60 miles with no problem at all, stopped for around hour and a half, then on the way home after only a couple of miles the needle started bouncing and did this all the way home to add to this, other strange things happened, the radio stopped on a couple of occasions, the sunroof seemed to operate quicker as did the window wipers ( hope this wasn’t just my imagination) at times.
Once home did a lot of research and found lots of potential possibilities it could be but first was check the reading at the battery, did this then reading when running, all spot on. Went and purchased a plug in (cigarette lighter type) voltage read out.
 
On Saturday I lifted the front carpet to gain access to the battery and it was obvious that liquid had come out of it, cleaned everything up.
 
 Sunday took the car out for about 45 minutes, all perfect, stopped for half an hour then on the journey back within a couple of miles it started bouncing, when everything was normal the readout was 14.1 to 14.3 when the needle started to bounce the readout was between 17.4 to 19.4 as soon as the needle stopped bouncing the read out was back to normal.
 
To me it sounds like the voltage regulator so will change the alternator but is there something else that I should look at first?

SteveJC
Region 13 RO
R13@porscheclubgb.com
Hereford, Worcester and Shropshire
2021 Boxster 25 GT Silver
2018 991.2 GTS Legend, Guards
2019 Macan S
1989 930 Turbo LE, Green
1957 MGA in Red


4 Replies

p27549
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p27549 Guest of the Club
Re: 1989 G50 Turbo 2020/09/14 11:09:13 (permalink)
i had a similar issue on my 88 turbo when i had it. In the end it came down to the alternator voltage spiking high at higher RPMS. If i put the headlights on heated window and loaded the electrical system it would reduce the issue. In the end a replacement alternator fixed the issue.
Cheers
 
TIM

Regards
TIM
1988-930 Targa Turbo (Currently owned)
1995-993 C2 Cab ( Awesome car)
1994-964 Turbo 2 3.6 (ouch what a beast)
1976-911 Carerra 3 Targa Sport ( Should not have sold it)
Timspu
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Timspu PCGB Member
Re: 1989 G50 Turbo 2020/09/14 11:28:02 (permalink)
Hi Steve,
i noted i was using an old profile which does not have me as a member . 
 
Hope you get your issues rectified.
 
Cheers
 
TIM
stfraser
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stfraser Guest of the Club
Re: 1989 G50 Turbo 2020/09/14 11:53:22 (permalink)
Hi Steve,
 
I had the exact same symptoms on my 930 which turned out to be the voltage regulator. The regulator bolts onto the alternator, so you will just need a new regulator (hopefully) not a new alternator.
 
Stu 

'86 930
SteveJC
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SteveJC PCGB Member
Re: 1989 G50 Turbo 2020/10/03 14:16:53 (permalink)
Installed new alternator and it all seems OK now, voltage readout is stable with no high spikes, no rev counter needle bounce and everything else works as it should. I decided to go with genuine new alternator from OPC and to be fair with the club discount it ended up a very fair price and this wasn't an exchange unit. 

SteveJC
Region 13 RO
R13@porscheclubgb.com
Hereford, Worcester and Shropshire
2021 Boxster 25 GT Silver
2018 991.2 GTS Legend, Guards
2019 Macan S
1989 930 Turbo LE, Green
1957 MGA in Red


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