MinorForum

Morris Minor Chat

Electrical mess

Moss Motors
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor

Midhurst80 Avatar
Midhurst80 Gold Member Bob Killam
Midhurst, ON, Canada   CAN
I have a 1098 negative ground, 2 dr salon which is very new to me. At first the direction signals worked well, then stopped. I charged the battery and they came back to life. The car started well. The car has no gauges. Today I bought a voltmeter and measured the battery 11.9v. I was guessing the generator was not working so I started the engine ran it at a fast idle, then removed the positive terminal - the engine immediately stopped but restarted when reattached. I would like to measure the voltage at the generator output, can this be done at the voltage regulator? What other tests can I do without a good ammeter?

As a next step - any suggestions for a good alternator.?
Bob

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
emjay Jim English
Marietta, PA, USA   USA
Get yourself a workshop manual. Most anyone of them has a simple procedure for testing the output of the generator and how to adjust the regulator. a voltmeter is the tool to use. A quick check is to take the belt and wires off and apply battery directly to the generator and it should spin. As I recall slowly if you only energies the main terminal and quickly if you power both terminals.

Midhurst80 Avatar
Midhurst80 Gold Member Bob Killam
Midhurst, ON, Canada   CAN
Thanks Jim. Will try.

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
0123 Mike D
Biddulph, Staffs, UK   GBR
Minor regulators are notoriously
difficult to tune, hence the soubriquet

Jo Lucas Crown Prince of Darkness

Negative earth Minors with
dynamoes are rare.

Almost any alternator that will
fit is a good bet.

Although, alternators bring their
own problems as your crank and
water pump pulley wheels are 1/2"

You need a modern, narrow belt
to spin an alternator efficiently

Modern, narrow fan belts don't
drive proper in 1/2" pulley wheels

The Fred in a shed solution was
to fit the dynamo pulley to the alternator

Which brings it's own problems in as
much as as the alternator spins too
slowly at tick over

The Fred in a shed solution here was
to speed up the tickover and start in 2nd

Even a good Minor dynamo don't push out
enough volts at tickover to charge a battery.

It takes about 13.5 volts to charge a battery

Herewith the relevant pages from the manual



Edited 4 time(s). Last edit at 2018-03-29 09:02 AM by 0123.


Attachments:
Ferd.pdf    224.2 KB

0123 Mike D
Biddulph, Staffs, UK   GBR
Aside from all that guff

The two normal causes
of flat batteries are

How tight is your fan belt?

How polished is your fan belt?

A new fan belt is often all it takes

bufferzone Avatar
bufferzone Gord Smith-Ritchie
Surfside Colony, CA, USA   USA
0123 Mike D
Biddulph, Staffs, UK   GBR
The most useful part of Gord's post
is near the bottom where it says
"Wear on the carbon brushes and commutator
is the most common cause of dynamo failure
"

As long as you remember,
wear / shine on the fan belt
is the most common cause

Brushes, and turning and
undercutting the commutator
are definitely second stage

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
Midhurst80 Avatar
Midhurst80 Gold Member Bob Killam
Midhurst, ON, Canada   CAN
An excellent resource. Just what I needed to see step #1 if it is developing a reasonable voltage. So many of my trips are short which compounds the problem. Thank you.

0123 Mike D
Biddulph, Staffs, UK   GBR
Your best answer is to fit a voltmeter and
keep you revs so the meter more than 13.5v

https://www.ebay.co.uk/itm/Electric-LCD-Red-Digital-Panel-Voltmeter-Volt-Meter-DC-4-5-30V-2-Wires-helpful/253344981359?hash=item3afc89a16f:g:RyYAAOSwh1paRdQi

Here's a revs against voltage
graph for a Matchless motorcycle

The DVR2 is an electronic regulator
The other line is with a normal reg

You need at least 13.5v to charge a lead acid
After 13.4v the charge against volts goes ballistic

The Minor regulator doesn't attempt to regulate
current, so make sure you don't exceed 14v

. Hide banner ads & support this website by becoming a > Gold Supporting Member <

Attachments:
ferd.jpg    18.6 KB
ferd.jpg

0123 Mike D
Biddulph, Staffs, UK   GBR
About current going ballistic as voltage rises

Here's a quote from the top boffin at Merlin Equipment

"a 300% increase in charge current by going
from 13.8 volts to 14.4 volts charge voltage.

At certain charge states the difference is
even greater. Up to a 400% increase
"

I think are likely to end up making a lot of smoke
unless you keep your output voltage below 14

. Hide banner ads & support this website by becoming a > Gold Supporting Member <

To add your reply, or post your own questions




Registration is FREE and takes less than a minute!


Having trouble posting or changing forum settings?
Read the Forum Help (FAQ) or contact the webmaster





Join The Club

Sign in to ask questions, share photos, and access all website features

Your Cars

1958 Morris Minor 1000 Saloon 2 door

Text Size

Larger Smaller
Reset Save

Sponsor Links