Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 10-19-2019, 02:16 PM   #1
keyswitch1
Member
 
Join Date: Mar 2019
Posts: 45
Default model a amp meter

My amp meter is showing a 10 amp discharge when driving. I sort of forgot if you should push the brush up or down ?? What say you ? Thank you in advance !!
keyswitch1 is online now   Reply With Quote
Old 10-19-2019, 03:02 PM   #2
Purdy Swoft
Senior Member
 
Purdy Swoft's Avatar
 
Join Date: May 2010
Location: Alabama
Posts: 7,420
Default Re: model a amp meter

You should push down on the adjustable third brush to increase charge rate .
Purdy Swoft is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 10-19-2019, 03:02 PM   #3
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: oregon
Posts: 3,912
Default Re: model a amp meter

Lights on or off?
J Franklin is offline   Reply With Quote
Old 10-19-2019, 03:05 PM   #4
eagle
Senior Member
 
eagle's Avatar
 
Join Date: Aug 2011
Location: Eagle Bend, MN
Posts: 1,498
Default Re: model a amp meter

Put a voltmeter on the battery first. Could be someone reversed polarity on the car without changing meter polarity, or several other reasons.
__________________
"There are some that can destroy an anvil with a teaspoon and shouldn't be allowed to touch anything resembling a tool."
eagle is offline   Reply With Quote
Old 10-19-2019, 04:12 PM   #5
keyswitch1
Member
 
Join Date: Mar 2019
Posts: 45
Default Re: model a amp meter

Lights off
keyswitch1 is online now   Reply With Quote
Old 10-19-2019, 04:26 PM   #6
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: oregon
Posts: 3,912
Default Re: model a amp meter

Either the generator is faulty or the meter or battery is backward.
J Franklin is offline   Reply With Quote
Old 10-19-2019, 04:27 PM   #7
Patrick L.
Senior Member
 
Patrick L.'s Avatar
 
Join Date: May 2010
Location: Upstate NY and western Florida
Posts: 5,186
Default Re: model a amp meter

Not much info.
Needle at zero when not running ?
Needle show discharge with lights on, engine off ?
Patrick L. is offline   Reply With Quote
Old 10-19-2019, 07:22 PM   #8
keyswitch1
Member
 
Join Date: Mar 2019
Posts: 45
Default Re: model a amp meter

Needle at zero when not running . Lights are not hooked up
keyswitch1 is online now   Reply With Quote
Old 10-19-2019, 09:21 PM   #9
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: oregon
Posts: 3,912
Default Re: model a amp meter

On what side of the battery is the ground strap?
J Franklin is offline   Reply With Quote
Old 10-20-2019, 06:28 AM   #10
Patrick L.
Senior Member
 
Patrick L.'s Avatar
 
Join Date: May 2010
Location: Upstate NY and western Florida
Posts: 5,186
Default Re: model a amp meter

No lights, well, we need to know how the ammeter is hooked up. You could be charging with the ammeter backwards. Or you may not be charging and the ammeter is correct. You appear to be 6v with generator which means the positive battery lead goes to ground. If you feed power to the generator with the belt off or loose the generator should spin or try to spin. Jumping across the cut-out will polarize the generator which might be what is needed. There is a lot of info we need to know.
Patrick L. is offline   Reply With Quote
Old 10-20-2019, 09:07 AM   #11
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 10,282
Default Re: model a amp meter

Polarity will affect the ammeter as was mentioned. A 10-amp discharge indicates high resistance somewhere as well. Just an ignition system won't draw that much. Condition of wiring, polarity, properly connected devices, and condition of the generator can all have an effect. Is this an original ammeter, or a reproduction? Reproduction units are not worth a crap. Make sure the electrical system is properly connected and ground paths are good and clean before doing any adjustments. The battery needs to be in good condition as well. A bad battery can kill a generator. The cut out needs to be functional as well.
rotorwrench is offline   Reply With Quote
Old 10-20-2019, 12:03 PM   #12
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: oregon
Posts: 3,912
Default Re: model a amp meter

Quote:
Originally Posted by J Franklin View Post
On what side of the battery is the ground strap?
The answer will narrow down and possibly answer the mystery!
J Franklin is offline   Reply With Quote
Old 10-20-2019, 06:04 PM   #13
keyswitch1
Member
 
Join Date: Mar 2019
Posts: 45
Default Re: model a amp meter

The positive side is grounded.
keyswitch1 is online now   Reply With Quote
Old 10-20-2019, 06:41 PM   #14
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: oregon
Posts: 3,912
Default Re: model a amp meter

Quote:
Originally Posted by keyswitch1 View Post
The positive side is grounded.
Ok now hook up a headlight, even temporary and turn it on, and tell us what the ammeter shows. My bet is the meter is hooked up in reverse.
J Franklin is offline   Reply With Quote
Old 10-20-2019, 06:45 PM   #15
keyswitch1
Member
 
Join Date: Mar 2019
Posts: 45
Default Re: model a amp meter

Which color wire goes to which side ?? Thank you
keyswitch1 is online now   Reply With Quote
Old 10-21-2019, 11:09 AM   #16
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: oregon
Posts: 3,912
Default Re: model a amp meter

Quote:
Originally Posted by keyswitch1 View Post
Which color wire goes to which side ?? Thank you
Of the ammeter? It doesn't matter, just reverse them if you are doing this specific test.
J Franklin is offline   Reply With Quote
Old 10-21-2019, 12:00 PM   #17
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 10,282
Default Re: model a amp meter

This is an excellent sight for answers. https://modelagarage.com/electrical/

If your lights aren't connected. Make sure that the light switch, associated wiring, and lamp assemblies are all connected properly and that the wiring is in good condition before switching the lights on.

On an original amp meter, just turning on the ignition should show a slight discharge unless the points are open. Cranking the starter will make the needle swing back & forth until it starts.

With the different types of cut out products and also the Fun Projects voltage regulator that looks like a cut out, a person needs to know what they have there. It can affect how the amp meter indicates a reading.
rotorwrench is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 08:51 PM.