Lazy Landy · May 9, 2007

been looking at the doozel lump that i just droped in my motor and the wiring is a bit odd, the No. 1 heater pulg has a wire comming from No. 2 and a wire going to earth on the timing case, all i know is the it was out of a 2A.

slob · May 9, 2007

are???? you ****ed??

Lazy Landy · May 9, 2007

Try again, i only had a little drink

slob · May 9, 2007

try putting this link in yer sig.

Code Breaking

Lazy Landy · May 9, 2007

slob · May 9, 2007

you int gonna tell us you dint write in code before you edited some of it

Lazy Landy · May 9, 2007

I just carn't spell very good you should know that by now!

slob · May 9, 2007

well can you atleast give us a clue?

Lazy Landy · May 10, 2007

I want to know if the engine has came out of a positive or a negative earth land rover

Pikey · May 10, 2007

Lazy Landy said:
I want to know if the engine has came out of a positive or a negative earth land rover

Series 2a changed from positive to negative earths around B & C Suffix (not sure what year that was) So you get some B Reg with negative earths and some C reg with Positive earths. What reg did yours come out of?

slob · May 10, 2007

would it be any different?? is thur any thing on a denzil of that age that is polarity consuss?

Lazy Landy · May 10, 2007

I dont know, alternator and will the starter motor spin the wrong way

slob · May 10, 2007

alternators are all neg earth . so if you ave a alt then its defo neg earth.

CharlesY · May 10, 2007

The GOLDEN RULE

Dynamos in UK were invariably POSITIVE earth systems

Alternators are almost invariably NEGATIVE earth systems.

However, glow plugs don't care about polarity. They just need to be wired correctly, and if your Landy ever was a 2.25 diesel you could be heading for a wiring mess, as those engines connected glow plugs in SERIES, and through a ballast resistor.

If you fit a later diesel, chances are its plugs should be connected in parallel, and NOT though the ballast resistor.

CharlesY

slob · May 10, 2007

CharlesY said:
The GOLDEN RULE

Dynamos in UK were invariably POSITIVE earth systems

Alternators are almost invariably NEGATIVE earth systems.

However, glow plugs don't care about polarity. They just need to be wired correctly, and if your Landy ever was a 2.25 diesel you could be heading for a wiring mess, as those engines connected glow plugs in SERIES, and through a ballast resistor.

If you fit a later diesel, chances are its plugs should be connected in parallel, and NOT though the ballast resistor.

CharlesY

you do get neg earth dynamos but you don't get pos earth alts! so yer golden rule is more of a murky brown colour

CharlesY · May 10, 2007

slob said:
you do get neg earth dynamos but you don't get pos earth alts! so yer golden rule is more of a murky brown colour

Not quite true on both counts.

ALL dynamos can easily be made to run either POSITIVE or NEGATIVE earth.
It is only a question of knowing how to "flash" them to get the polarity set to start with, or even later to change it. Once the residual magnetism in a dynamo is set up, it will self-excite only the right way.

Nothing much will go wrong anyway. The starter motor will NOT run backwards because it is .... well, it just won't - so there. Nor will fan-blowers and radiator fans either, so long as they are series-wound which is probable.

There ARE positive earth alternators to be had, for use when polarity matters but you want to dump the dynamo for an alternator. But they are rare.

Easy-Peasy to have a dynamo arranged for either system, but POSITIVE earth is almost always the rule, especially in UK. If anyone wants to argue, they can let me know of a UK make and model in the last 50 years that uses a negative earth dynamo system. I'm waiting ....

CharlesY

slob · May 10, 2007

njust to save you a long wait ...triumph spitfires and vw beetles both had neg earth dynamos fitted at some time... probelly some other triumph models as well..and we know how easy it is to swap them from neg to pos. specially today wiff al the info available on the net.

oh we know VW int a brit make but am sure the likes of morris and austin had them aswell. just not so sure on them ..

can you supply a make that uses a pos earth alt??

Lazy Landy · May 10, 2007

Why didn't i think of that!

cheers!

Pikey · May 10, 2007

CharlesY said:
ALL dynamos can easily be made to run either POSITIVE or NEGATIVE earth.
It is only a question of knowing how to "flash" them to get the polarity set to start with, or even later to change it. Once the residual magnetism in a dynamo is set up, it will self-excite only the right way.

CharlesY

I "self-excite" myself quiet often and I dont need to be flashed for it to happen

slob · May 10, 2007

but you're a perv
or as hybread says redhandshandy

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