alt light stays on - new volt reg?

[merrill]

so, 66 230 sl, purchased a new voltage reg from K&K  MFG  
bosch pn 0 192 062 007  
MB part 002-154-74-06

started the car, the red light came on, drove the car  red light still on,  hmm,  the volt meter said 11.9 volts.


put old volt reg back on car = no red light.  and volt meter went up to 12.7 volts.

thoughts?
the alt has been on the car for quite some time.

Matt
Austin Tx
66 230 sl - "white"
78 300 D - Blue
98 C230

[hands_aus]

If the fan belt is loose the alternator will not put out enough volts under load.



Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL, auto

[merrill]

Bob,
I agree, however the belt is quite tight, very little deflection.

when I put the old volt reg on the light went off. no other change?

matt

Matt
Austin Tx
66 230 sl - "white"
78 300 D - Blue
98 C230

[Cees Klumper]

Sounds like that new voltage regulator is defective, no?

Cees ("Case") Klumper in Amsterdam
'69 white 280 SL automatic

[merrill]

problem solved,

using the fantastic color coded wiring diagram that I received in the pagoda world I found that I had wired the plug that goes into the alt backwards.

I had the DF and D+ wires reversed.

corrected the wiring and alt light went out and the volt meter seemed to hold the voltaage stable.

Matt
Austin Tx
66 230 sl - "white"
78 300 D - Blue
98 C230