Complete rewire with alternator and no junction box

Post by **Matt** » Thu Jan 03, 2008 11:34 pm

HI Guys

Just got my trav back on the road and it has no end of electrical gremlins because the loom has been butchered really badly in the past.

I have a loom from the same year, but I have an alternator rather than a dynamo, and dont have the regulator box on the bulkhead

Can anyone explain to me how I need to connect the alternator/dynamo wiring? Im intending to start the job tomorrow

Post by **8009STEVE** » Fri Jan 04, 2008 9:51 am

have a look here
http://www.mmoc.org.uk/index.php?name=P ... ic&t=17262

Post by **8009STEVE** » Fri Jan 04, 2008 9:56 am

Sorry wrong one. try this
http://www.mmoc.org.uk/index.php?name=P ... ic&t=16856

Post by **Matt** » Sat Jan 05, 2008 4:36 pm

Without the regulator box I have a mass of wires that have nowhere to connect. Which can I leave flapping in the breeze and and which do I need to connect to each other? ('67 car and loom)

Other than that I think I have the rewire pretty much sorted

Post by **bmcecosse** » Sat Jan 05, 2008 5:46 pm

For the alternator - you just need a wire from the BIG terminal directly to the main 12v +ve bus - should be thick brown wire, usually on the solenoid. And a wire from the ign warning light goes directly to the small terminal - other side of warning light is fed from ign switch. Otherwise - just bundle all the same colour wires together in a piece of chock-block. And see what happens! Do not join any wires that don't have exactly the same colour - keep them separate from all others.

Post by **Matt** » Sat Jan 05, 2008 5:51 pm

The first bit was done, i was just wondering what to do with all those "other" wires up at the regulator end...

cheers BMC

Post by **bigginger** » Sat Jan 05, 2008 5:54 pm

And Puuuuuuuuurlease don't use 'choc block'. Fine and dandy, I'm sure, for domestic wiring, but under vibration, not so hot
a

Post by **bmcecosse** » Sat Jan 05, 2008 5:58 pm

Mine came to me on chock block 7 years ago - never been any problem! It is used widely in industry! But if I was doing the job - in fact I would use the old regulator as the connector strip - but it would have no function, and it would look more 'original'.

Post by **Matt** » Sat Jan 05, 2008 6:03 pm

I dont have the regulator, the car came to me without it, and because theres a marina pedal box fitted, I have had to move the new look out slightly so the wires wouldnt reach anyway

There are going to be no choc blocks or scotchlocks anywhere on this car!

Post by **RussLCV** » Wed Jan 09, 2008 7:50 pm

I fitted 2 fuse boxes as they were needed................you will still need to join 4 wires or remove them?

Post by **RussLCV** » Wed Jan 09, 2008 7:51 pm

I fitted 2 fuse boxes as they were needed................you will still need to join 4 wires or remove them?

Post by **bmcecosse** » Wed Jan 09, 2008 9:18 pm

Yes - join all wires with SAME colour.

Post by **Matt** » Wed Jan 09, 2008 10:06 pm

Its not just that BMC as I discovered

Brown connects to Brown/Blue and Brown/Green connects with the smaller Brown/Yellow

I have a marina pedal box so room is a bit more limited, however i now have 2 blade type fuse boxes on the top of the pedal box and everything works

Post by **bmcecosse** » Thu Jan 10, 2008 3:37 pm

Brown/blue goes off (unfused) to feed the lights - and was originally 'joined' within the regulator where it automatically pulled up the charging when the lights were in use. So yes, correct now to join with brown.
The brown/green should come from the alternator output terminal (or just use brown), and yes it connects to the main 12ve + bus - but should NOT be joined to brown/yellow which is the sensor wire from the smaller terminal on the alternator. That brown/yellow should only go to the ignition warning light, and not to anything else. The other side of that warning light being white and is connected to the ignition switch.

Post by **Matt** » Thu Jan 10, 2008 7:18 pm

Do not join any wires that don't have exactly the same colour - keep them separate from all others.

So its not what you said before then!

The brown/green should come from the alternator output terminal (or just use brown), and yes it connects to the main 12ve + bus - but should NOT be joined to brown/yellow which is the sensor wire from the smaller terminal on the alternator.

And from the wiring diag, and the loom thats in my car, the alternator output is brown/yellow and the signal wire is brown/green. There is no way I would put more than 5A through the piddly brown/green wire!

So the brown/green connects to the smaller of the brown/yellow wires which goes to the ignition/charge light.

Post by **bmcecosse** » Fri Jan 11, 2008 9:33 pm

Well - my original statement was meant as a nice safe 'get you going' starter - I did say main cable and sensor cable would be required. You would then have had no working lights - and that's where the brown to brown /blue thing comes in. The colour of the sensor cable has changed over the years- but basically you need a little wire from the ign warning light directly to the small terminal on the alternator - and NOT connected to anything else!

Post by **southerly95** » Mon May 12, 2008 9:08 pm

Hi - I have similar issue as on these posts. I shortened the alternator cable as it was far too long and was catching the alternator pulley. On the three wire block, does the thick brown wire go in the middle or the inner position? Both brown wires have the larger connector so could be either.

I know - I should have made a note, more haste etc

Morris Minor Owners Club

Complete rewire with alternator and no junction box

Complete rewire with alternator and no junction box

Which brown wire goes where