Thunderace
Spa-Francorchamps
- Joined
- 25 Aug 2020
- Messages
- 257
Hi guys
I'm planning to do the Martin Hill ekectric steering pump mod on my 996 (conversion to electric hydraulic steering pump) and also have an intermitent light screech coming from an ancilliary so thought I'd pre-handle the alternator to handle the extra load, so i started looking .. what a nightmare! there are literally endless alternator models available and it confused the hell out of me so having sorted out the problem I thought I may as well post it in case it helps someone else.
1) Ampage: I had no idea but there are two ampages, 120a and 150a, I didn't care enough to look into it deeply but my initial guess is that the 120a is for manual and the 150a for tiptronic as they tend tto be listed as manual/tip. It would have been so easy to have bought a 120a which would have been useless.
2) Models - I had to reasearch this with Porsche Norwich as nobody knew but it turned out: -
996/7 alternators are interchangeable and have part numbers: -
- 996603012*
- 997603012*
Mine is a 996.1 cab and the original part is 99660301206, BUT from the Porsche parts perspective all versions have currently (18-02-2023) been superceded by the part: -
99760301212
Note and correction thanks to Griffter
Please be aware that there are two types of alternator, one has an overrun clutch, by all accounts this was fitted to manual cars but the general concensus appears to be that this is the best choice for all.
I also found a company near me in Colchester Universal who are specialists in these systems they were very professional and knowledgeable on the phone and say they can take a 150a alternator and rebuild it to close to 200a for a very reasonable cost so I may do that to the new alternator.
I should also mention having searched the forums that there are posts here which talk about the cheaper solutions of replacing the regulator, rebuild kits etc.
I'm planning to do the Martin Hill ekectric steering pump mod on my 996 (conversion to electric hydraulic steering pump) and also have an intermitent light screech coming from an ancilliary so thought I'd pre-handle the alternator to handle the extra load, so i started looking .. what a nightmare! there are literally endless alternator models available and it confused the hell out of me so having sorted out the problem I thought I may as well post it in case it helps someone else.
1) Ampage: I had no idea but there are two ampages, 120a and 150a, I didn't care enough to look into it deeply but my initial guess is that the 120a is for manual and the 150a for tiptronic as they tend tto be listed as manual/tip. It would have been so easy to have bought a 120a which would have been useless.
2) Models - I had to reasearch this with Porsche Norwich as nobody knew but it turned out: -
996/7 alternators are interchangeable and have part numbers: -
- 996603012*
- 997603012*
Mine is a 996.1 cab and the original part is 99660301206, BUT from the Porsche parts perspective all versions have currently (18-02-2023) been superceded by the part: -
99760301212
Note and correction thanks to Griffter
Please be aware that there are two types of alternator, one has an overrun clutch, by all accounts this was fitted to manual cars but the general concensus appears to be that this is the best choice for all.
I also found a company near me in Colchester Universal who are specialists in these systems they were very professional and knowledgeable on the phone and say they can take a 150a alternator and rebuild it to close to 200a for a very reasonable cost so I may do that to the new alternator.
I should also mention having searched the forums that there are posts here which talk about the cheaper solutions of replacing the regulator, rebuild kits etc.