• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

Wiring Check. Alternator wiring.

cjowett

Freshman Member
Offline
72MGB rebuilt Alternator but no wiring reference.
Can anyone tell me where the Black, Brown and Yellow wires connect to?
It may need someone to go and look at their own just to check but I would be very grateful as I have been trying to find out for over a week now.
Thanks.
 

Attachments

  • 198900-IMG_8679.GIF
    198900-IMG_8679.GIF
    189.2 KB · Views: 29

Bugeye58

Yoda
Offline
What's the part number of the alternator? There are different alternators, and the rectifier wiring is specific to the alternator being used.
Jeff
 

AlanT

Jedi Trainee
Offline
There should be no black wires going to the alternator. The solid brown wires go to the larger terminals with the larger gauge wire going to the middle terminal. If there is an 'exciter' wire it goes beside the big brown wire on the large terminal adjacent to it. The small brown/yellow goes to the small terminal. This is assuming you have the three terminal alternator. Check/clean the connections on the starter solenoid . Also , make sure the alternator light works correctly.

Alan T
 

Bugeye58

Yoda
Offline
Alan, he is referring to the internal wiring of the regulator, judging by his attached picture. Just need to know which alternator.
Jeff
 

AlanT

Jedi Trainee
Offline
Oops.....missed the pic. The original alternator had a three or four wire regulator. Rebuilders typically replaced it with a two wire and connected it differently. So is that regulator a two wire regulator?

Alan T
 

AlanT

Jedi Trainee
Offline
Well I have a perfect image of the alternator you need to see but cannot get it to download because the file is too large. Anywho , the black wire goes under the brush holder bolt (ground) , the yellow wire on the outer brush contact and the orange wire opposite the yellow on the same contact.
There should be a jumper connection from the center brush to the top of the regulator .
Alan T
 
OP
C

cjowett

Freshman Member
Offline
I'm afraid it has no part number visible. I'm going to see if I can work it out by the post that AlanT has written. Thanks for your help.
Colin.
 
OP
C

cjowett

Freshman Member
Offline
OK, that is well described and should help me get my car on the road. I'll let you know!
Thanks
Colin. /ubbthreads/images/graemlins/driving.gif
 
OP
C

cjowett

Freshman Member
Offline
It Runs!!!!!!!

Ignition light is still on but I think that is because the battery is so old and needs replacing.
 
Offline
Ignition light only comes on when the alternator is not working right... It's not a battery light.... Unfortunately. /ubbthreads/images/graemlins/frown.gif
 

DrEntropy

Great Pumpkin
Gold
Country flag
Offline
Before condemning the battery, charge it for a good while and try again... worth a shot.
 
OP
C

cjowett

Freshman Member
Offline
Worth trying. I like to save money. I come from Yorkshire in the UK where we keep our wallets under lock and key! /ubbthreads/images/graemlins/england.gif
 
Offline
My wallet hasn't been seen nor heard from since 1995. /ubbthreads/images/graemlins/grin.gif
 
OP
C

cjowett

Freshman Member
Offline
AlanT,

As my Ignition light is still on I suspect I did not fully understand your response but if you have an image would you mind sending it to me by e mail?
My address is colinjowett@gmail.com if you wouldn't mind.
Thanks,

Colin.
 

AlanT

Jedi Trainee
Offline
Colin,
The image has been sent to you. The extra piece with the yellow wire is a surge diode and not found in too many rebuilt units.

Alan T
 
OP
C

cjowett

Freshman Member
Offline
Well, I made the change and it runs perfectly with no ignition light on and the battery seems to be holding charge again. Thanks for your help, it's great knowing that there are others willing to help.
/ubbthreads/images/graemlins/cheers.gif
 

AlanT

Jedi Trainee
Offline
Colin,
Make sure the light comes on with the engine off and the ignition on. Then if it goes out when the engine is running it almost has to be charging.
Alan T
 
Similar threads
Thread starter Title Forum Replies Date
S Overdrive Wiring Check Austin Healey 12
P TR2/3/3A TR3 turn signal and horn control wiring check Triumph 4
B Wiring Check Austin Healey 3
R Wiring ??'s Spridgets 0
Healey Nut Rear Wiring Routing Austin Healey 2
7 General TR Wiring harnesses Triumph 5
Got_All_4 TR5/TR250 Wiring/Electrical Mystery Worked Perfect Then Not Triumph 5
MGTF1250Dave T-Series TF Windscreen Wiper wiring MG 4
M TR6 Fuse box wiring mystery Triumph 9
Healey Nut Wiring Harness Routing Austin Healey 5
J Wiring Harness Austin Healey 5
nichola TR6 Question on new wiring harness Triumph 6
R TR2/3/3A 1954 TR-2 O.D. Wiring Triumph 9
TomMull Dash wiring Plus 2 S Lotus 16
MadRiver BT7 Wiring Diagram Austin Healey 4
R TR2/3/3A Replace wiring harness in steering column Triumph 61
B Bugeye Electrical Wiring Diagram in Logic Format Spridgets 13
J TR6 73 TR6 Temp Gauge Wiring Question Triumph 6
Sopwith_Camel MGB wiring new Tacho MG 0
Ripper01 For Sale- TR6 Wiring Harness Triumph Classifieds 0
R TR2/3/3A Install new wiring harness in steering column Triumph 16
R TR2/3/3A Steering Column Wiring Triumph 18
Got_All_4 TR5/TR250 Pros and Cons to Wiring The Radio Direct Triumph 6
R TR2/3/3A Wiring from the steering column Triumph 7
D TR2/3/3A Tr3 horn testing and wiring Triumph 8
B Bugeye Sprite Wiring Diagram Spridgets 1
JPSmit Todays question - wiring Spridgets 14
P TR6 Wiring problem Triumph 50
ckeithjordan TR2/3/3A Overdrive Wiring Triumph 5
M General MG OEM Radio wiring help MG 4
R TR2/3/3A Overdrive wiring installation Triumph 14
ckeithjordan TR2/3/3A Wiring Harness Question[s] Triumph 10
nichola TR6 Victoria British wiring harness for TR6 Triumph 6
C For Sale MGA wiring harness MG Classifieds 3
C MGA Wiring harness question MG 6
JPSmit I'm stumped - wiring Spridgets 2
R TR2/3/3A Wiring 1954 TR-2 Triumph 12
L Wiring chan Austin Healey 1
W Tach wiring problems Jaguar 12
Michael Oritt LED bulb/resistor wiring question Austin Healey 24
Michael Oritt Safety-wiring knock-offs Austin Healey 24
H Re: electrical short wiring damage Spridgets 11
F TR2/3/3A I'm stuck... alternator/wiring/starting/? Triumph 2
R TR2/3/3A Wiring Nightmare Triumph 26
C Wiring for two front Driving Lights? Austin Healey 22
apbos Positive Ground Alternator wiring. Spridgets 9
BoyRacer Wiring question for alternator conversion Austin Healey 3
BoyRacer Need Tips on getting wiring harness through firewall Austin Healey 4
R TR2/3/3A Installing wiring harness in steering column Triumph 59
6 Relay wiring positive ground Spridgets 4

Similar threads

Top