FITTING AN ALTERNATOR
Posted: Tue Feb 06, 2007 9:42 pm
I would like to fit an alternator to my 1970 S4 36/9681 (negative earth) but I am confused with the wiring as my car seems to have part S3 and S4 electrical installation. It is fitted with a RB106 control box but the wiring diag. is for a S4. Could someone confirm the new wiring connections that I need to modify.
Position A1 - brown/blue - feed to dash. light switch/int. light/ig. switch.
Positon A - brown- main feed from solenoid/battery.
Position A - blue-feed to relays, main lights.
All the above to be connected together with the feed output from the new alternator.
Position F - brown/green- not used not required ex. dynamo.
Positon D - brown/yellow- (heavy gauge cable) not required ex. dynamo.
Position D - brown/yellow- ign. switch, connects to alternator.
Could someone confirm these mods to be correct.
Also does the tacho. need altering from the original RV 1 to work correctly.
I have a quote for an alternator from www.alternatormart.co.uk new complete with fan and pulley for ?54.95 inc. vat they have recommended the Lucas A127 unit max output 70 amps but under normal conditions would not produce this as it has a sensing regulator, when the battery is charged or no electrical load it adjusts accordingly. My question now is, is it sensible to fit a fuse on the alternator, if so what would be a safe rating. I am thinking of 35 amps. I do not think the total electrical load on the car is likely to exceed this. But I would appreciate any thoughts, experience and confirmation that I not about to have a pyrotechnic experience.
Thanks for any help you can give me.
John.
Position A1 - brown/blue - feed to dash. light switch/int. light/ig. switch.
Positon A - brown- main feed from solenoid/battery.
Position A - blue-feed to relays, main lights.
All the above to be connected together with the feed output from the new alternator.
Position F - brown/green- not used not required ex. dynamo.
Positon D - brown/yellow- (heavy gauge cable) not required ex. dynamo.
Position D - brown/yellow- ign. switch, connects to alternator.
Could someone confirm these mods to be correct.
Also does the tacho. need altering from the original RV 1 to work correctly.
I have a quote for an alternator from www.alternatormart.co.uk new complete with fan and pulley for ?54.95 inc. vat they have recommended the Lucas A127 unit max output 70 amps but under normal conditions would not produce this as it has a sensing regulator, when the battery is charged or no electrical load it adjusts accordingly. My question now is, is it sensible to fit a fuse on the alternator, if so what would be a safe rating. I am thinking of 35 amps. I do not think the total electrical load on the car is likely to exceed this. But I would appreciate any thoughts, experience and confirmation that I not about to have a pyrotechnic experience.
Thanks for any help you can give me.
John.