[Healeys] MORE: Generator?

[Alex]

Hi Michael,

First I checked the field winding's continuity with an ohmmeter. It 
isn't open, but I have no way of knowing what the correct resistance 
should be (there may be shorted windings for all I know).

Then I tied the output terminal (D) to the field winding terminal (F) 
with a short robust clip lead.

In any case, when I run the engine with the generator windings tied 
together and disconnected from the car's wiring, I get about 12 volts 
DC. If I rev the engine to 3000 RPM, the voltage doesn't rise. That 
seems to me to indicate a flaky generator.

I pulled the generator out today and will bring it to a local re-build 
shop for an evaluation. Interestingly, the generator does not have a 
cover band over the commutator and brush area, as shown in the shop 
manual on Page N.9.

It may be that this generator was replaced years ago with some sort of 
OEM part that wasn't Lucas.

I notice that the Nocks at British Car Specialists offer rebuilt 
generators. Has anyone deployed one of these refurbished units?

== Alex in Maine
      1960 BT7, "The Blue Mainie"


On 9/3/2018 11:31 AM, Michael Salter wrote:
> In my experience the most reliable test for a generator is as 
> explained in the Workshop Manual.
> Remove the leads, bridge the D & F terminals then test the voltage to 
> ground with rising RPM.
> I've always found it to be foolproof.
>
> M
> ------------------------------------------------------------------------
> *From:* Healeys <healeys-bounces at autox.team.net> on behalf of Alex 
> <alexmm at roadrunner.com>
> *Sent:* Monday, September 3, 2018 9:11:06 AM
> *To:* jim; healeys at autox.team.net
> *Subject:* Re: [Healeys] Generator?
>
> Thank you for your note, Jim.
>
> I will use my ohmmeter today to check the continuity of the field winding.
>
> == Alex in Maine
>      1960 BT7, "The Blue Mainie"
>
>
>
> On 9/3/2018 3:13 AM, jim wrote:
>>
>> On Sunday, September 2, 2018, 6:42:38 PM PDT, Alex 
>> <alexmm at roadrunner.com> wrote:
>>
>>
>>
>> My BT7 generator seems dead. There's no output voltage at point D on the
>> generator at speed.
>>
>>
>> == Alex in Maine
>> 1960 BT7
>>
>> Got any voltage on the field winding? gotta have excitation to make 
>> the generator gen..If you do have voltage there, remove the wire and 
>> check for continuity to ground through the field winding..current 
>> flow is what makes it all work ..Maybe put a dc ammeter in the field 
>> winding circuit and see whats what
>>
>> Jim
>>
>
>
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