[Healeys] MORE: Generator?

Tue Sep 4 10:13:56 MDT 2018

With reference to Generator issues, I can offer the attached which some of
you may not have.

Faced with a (hopefully not) dodgy genny and a Chinese control box, one
might be tempted to go for an alternator? (This entails gutting the control
box which might give some satisfaction?)

Simon

From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Alex
Sent: 03 September 2018 19:16
To: Michael Salter <michael.salter at gmail.com>; jim <ab7vf at yahoo.com>;
healeys at autox.team.net
Subject: [Healeys] MORE: Generator?

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  <mailto:healeys-bounces at autox.team.net>
<healeys-bounces at autox.team.net> on behalf of Alex
<mailto:alexmm at roadrunner.com> <alexmm at roadrunner.com>
Sent: Monday, September 3, 2018 9:11:06 AM
To: jim; healeys at autox.team.net <mailto: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
<mailto:alexmm at roadrunner.com> <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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