starter motors and positive to negative earth conversion

My mate is in the process of rebuilding an old petrol 2A, and in the
process is converting it to negative earth.

Its all fairly obvious except for the starter motor. Will this just
work as normal if he swaps the earth round, or are +ve earth and -ve
earth starters different items? (and therefore will it go bang or go
backwards?)

Ta

Tom Woods wrote:
> My mate is in the process of rebuilding an old petrol 2A, and in the
> process is converting it to negative earth.
>
> Its all fairly obvious except for the starter motor. Will this just
> work as normal if he swaps the earth round, or are +ve earth and -ve
> earth starters different items? (and therefore will it go bang or go
> backwards?)

No changes necessary. The starter will just work without being touched.

There's only 4 things he'll need to change:

Ammeter polarity (swap the wires on the back of it).
The polarity of the dash mounted sockets (ie the colour).
The ignition coil polarity (swap the wires on it)
The generator polarity (have a google) or otherwise this is the ideal
time to do an alternator conversion.



--
EMB

"Tom Woods" <[email protected]> wrote in message
news[email protected]...
> My mate is in the process of rebuilding an old petrol 2A, and in the
> process is converting it to negative earth.
>
> Its all fairly obvious except for the starter motor. Will this just
> work as normal if he swaps the earth round, or are +ve earth and -ve
> earth starters different items? (and therefore will it go bang or go
> backwards?)
>
> Ta
>

No need to swap anything on the starter especially if its an older model,
the rotation will be the same as they are not a permanent magnet motor. Same
with the old generators except you may need to flash the field coil over by
connecting it momenteraly to a batery.

Peter.

On Thu, 02 Dec 2004 09:14:13 +1300, EMB <[email protected]> wrote:

>Tom Woods wrote:
>> My mate is in the process of rebuilding an old petrol 2A, and in the
>> process is converting it to negative earth.
>>
>> Its all fairly obvious except for the starter motor. Will this just
>> work as normal if he swaps the earth round, or are +ve earth and -ve
>> earth starters different items? (and therefore will it go bang or go
>> backwards?)
>
>No changes necessary. The starter will just work without being touched.
>
>There's only 4 things he'll need to change:
>
>Ammeter polarity (swap the wires on the back of it).
>The polarity of the dash mounted sockets (ie the colour).
>The ignition coil polarity (swap the wires on it)
>The generator polarity (have a google) or otherwise this is the ideal
>time to do an alternator conversion.

Thanks guys. It's getting a rewire and an alternator too so everything
else should be covered.

On or around Thu, 02 Dec 2004 09:14:13 +1300, EMB <[email protected]>
enlightened us thusly:

>Ammeter polarity (swap the wires on the back of it).
>The polarity of the dash mounted sockets (ie the colour).
>The ignition coil polarity (swap the wires on it)
>The generator polarity (have a google) or otherwise this is the ideal
>time to do an alternator conversion.

something that doesn;t apply to this one but I heard of a bit back... very
early 2¼ engine blocks have a dynamo mount that won't allow fitting an
alternator.

On or around Wed, 1 Dec 2004 20:16:41 -0000, "Peter Seddon"
<[email protected]> enlightened us thusly:

>
>"Tom Woods" <[email protected]> wrote in message
>news[email protected]...
>> My mate is in the process of rebuilding an old petrol 2A, and in the
>> process is converting it to negative earth.
>>
>> Its all fairly obvious except for the starter motor. Will this just
>> work as normal if he swaps the earth round, or are +ve earth and -ve
>> earth starters different items? (and therefore will it go bang or go
>> backwards?)
>>
>> Ta
>>
>
>No need to swap anything on the starter especially if its an older model,
>the rotation will be the same as they are not a permanent magnet motor. Same
>with the old generators except you may need to flash the field coil over by
>connecting it momenteraly to a batery.


heater blower motor might go backwards, mind. I've seen both kinds of motor
on heaters.

On Thu, 02 Dec 2004 10:59:54 +0000, Austin Shackles
<[email protected]> wrote:

>On or around Thu, 02 Dec 2004 09:14:13 +1300, EMB <[email protected]>
>enlightened us thusly:
>
>>Ammeter polarity (swap the wires on the back of it).
>>The polarity of the dash mounted sockets (ie the colour).
>>The ignition coil polarity (swap the wires on it)
>>The generator polarity (have a google) or otherwise this is the ideal
>>time to do an alternator conversion.
>
>something that doesn;t apply to this one but I heard of a bit back... very
>early 2¼ engine blocks have a dynamo mount that won't allow fitting an
>alternator.

Can you not just change the mount in that case? My landy came with a
petrol engine with an alternator conversion. I think most of the
brackets on that were lifted off a metro or something along with the
alternator.

On Thu, 02 Dec 2004 11:00:50 +0000, Austin Shackles
<[email protected]> wrote:

>heater blower motor might go backwards, mind. I've seen both kinds of motor
>on heaters.

Would that actually make any difference to the amount of heat produced
in the cab?
We will find out if the heater goes backwards as i'm going to stick it
on my 2A, while he's had one of my spare series 3 bulkheads and a
series 3 heater.

On or around Thu, 02 Dec 2004 23:01:40 +0000, Tom Woods
<[email protected]> enlightened us thusly:

>On Thu, 02 Dec 2004 10:59:54 +0000, Austin Shackles
><[email protected]> wrote:
>
>>On or around Thu, 02 Dec 2004 09:14:13 +1300, EMB <[email protected]>
>>enlightened us thusly:
>>
>>>Ammeter polarity (swap the wires on the back of it).
>>>The polarity of the dash mounted sockets (ie the colour).
>>>The ignition coil polarity (swap the wires on it)
>>>The generator polarity (have a google) or otherwise this is the ideal
>>>time to do an alternator conversion.
>>
>>something that doesn;t apply to this one but I heard of a bit back... very
>>early 2¼ engine blocks have a dynamo mount that won't allow fitting an
>>alternator.
>
>Can you not just change the mount in that case? My landy came with a
>petrol engine with an alternator conversion. I think most of the
>brackets on that were lifted off a metro or something along with the
>alternator.

Not on this one, it's apparently part of the block. Or so I was told.

On Fri, 03 Dec 2004 07:26:56 +0000, Austin Shackles
<[email protected]> wrote:

>>>something that doesn;t apply to this one but I heard of a bit back... very
>>>early 2¼ engine blocks have a dynamo mount that won't allow fitting an
>>>alternator.
>>
>>Can you not just change the mount in that case? My landy came with a
>>petrol engine with an alternator conversion. I think most of the
>>brackets on that were lifted off a metro or something along with the
>>alternator.
>
>Not on this one, it's apparently part of the block. Or so I was told.

LR did offer a part which picked up on the bottom dynamo bracket and a
location down by the sump somewhere, to form the lower bracket for the
acr series alternator. I converted a series 2 some 10 years ago with
one. I thought there was also some issue with a voltage stabiliser for
the fuel gauge.

AJH