The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Work those trucks!




Stovebolt is pleased to support the Salvation Army!
We're doing fine but many around the World are not. Instead of making a contribution to us this holiday season, how about making your contribution to a great organization with a long history of helping people in need around the world?

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
12 registered members (Greg_H, D B Cooper, Cosmo, Dachshund, 5 Window 9434, 1 invisible), 346 guests, and 3 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums48
Topics116,579
Posts930,677
Members42,658
Most Online940
Apr 5th, 2017
Image Posting Policy
Previous Thread
Next Thread
Print Thread
new alternator not charging? #1332298 Sat Nov 02 2019 06:31 PM
Joined: Sep 2019
Posts: 45
M
MontanaLee Offline OP
Wrench Fetcher
I just put on a new 6 volt alternator on and connected the shot wire to the battery connection on the starter and the exciter to the hot side of the coil. I went for a decent ride and when I went to restate the battery was down. what is the best way to determine if the alternator is charging? 235 on a 48 Chevy. thanks.


1948 3/4 ton Chevy Pickup
Re: new alternator not charging? [Re: MontanaLee] #1332300 Sat Nov 02 2019 06:51 PM
Joined: Jan 2016
Posts: 493
S
showkey Offline
Shop Shark
Measure the voltage at the battery with the engine running..........should be about 8 volts +/- .

Re: new alternator not charging? [Re: MontanaLee] #1332306 Sat Nov 02 2019 07:27 PM
Joined: Sep 2019
Posts: 45
M
MontanaLee Offline OP
Wrench Fetcher
thanks


1948 3/4 ton Chevy Pickup
Re: new alternator not charging? [Re: MontanaLee] #1332309 Sat Nov 02 2019 07:55 PM
Joined: Feb 2004
Posts: 19,277
H
Hotrod Lincoln Offline
Boltergeist
8 V is too much. Look for 7.5V against a fully-charged battery. This is vitally important, as the condition of the battery is what determines what the voltage regulator does. Setting or checking regulator settings against a partially-discharged battery is an impossible task.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: new alternator not charging? [Re: MontanaLee] #1332727 Wed Nov 06 2019 05:40 AM
Joined: Nov 2007
Posts: 190
K
Kennethw Offline
Shop Shark
stick a screwdriver or something to the rear bearing on the back of the alternator. If its putting out it will be magnetized and stick.

What kind of alternator is it? Delco 10SI with internal regulator maybe? If so it would have either been built with a 6 volt self exciting regulator that excites when your alternator rpms increase or a 6 volt non-self exciting regulator and you will need an exciter wire to the alternator to excite the regulator.

Re: new alternator not charging? [Re: MontanaLee] #1333736 Thu Nov 14 2019 01:19 PM
Joined: Sep 2013
Posts: 913
M
moparguy Offline
Shop Shark
Lee, I suspect this thread is fully linked to your thread on you truck not starting with it's new Optima 6 volt battery. My truck had a 6 volt alternator already installed when I bought it. However, due to the slow speed required on a lot of my rural country roads in the winter with headlights on and heater blowing it would not keep the battery charged. Problem was the alternator needed to operate at higher rpm. Well, that wasn't gonna happen and my net searches led me to install a 6 volt taillight bulb under the dash (used a old taillight socket) to act as an exciter. Now if the engine is running no matter how slow, the alternator is charging. No more problems.

I trust someone here can talk about this in detail, if I can find the info detailing exactly how to do the above, I'll post it. It's been so long ago I really don't recall the details.

Good Luck,
RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: new alternator not charging? [Re: MontanaLee] #1333738 Thu Nov 14 2019 01:38 PM
Joined: Sep 2013
Posts: 913
M
moparguy Offline
Shop Shark
OK, this is the thread with details on what made my alternator charge at low rpm. Lots of information in general on the challenges of getting our old truck doing what they should electrically speaking.

Good Luck,

RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A




Moderated by  Rusty Rod 

Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.3