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Charging issues
#1187133 Mon Oct 17 2016 04:02 PM
Joined: Aug 2015
Posts: 19
R
New Guy
I have a 51 3100 with what I think is a mid 60s engine and trans (casting numbers). When the switch was made, I assume the truck was converted to 12v at the same time. It's running an external regulator. About a year ago my gauge was showing random charging in 1v increments. Took it to autozone, tested, and it was the voltage regulator. No problems for a year. Recently the gauge is showing 11.5v. Replaced the alternator and no change. Checked voltage at alternator 11.5v. Bench tested alternator at parts store, tested good. Replaced voltage regulator, no change. Had truck tested at parts store, faulty regulator. Replaced regulator, no change.

So any thoughts? 2 bad regulators in a row?

I could swap for a 1 wire, but I'm invested with the setup now.

Thanks in advance

Ryan

Re: Charging issues
ryanhewitt #1187139 Mon Oct 17 2016 04:31 PM
Joined: Apr 2005
Posts: 8,755
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Bad regulators not uncommon these days! ohwell


Martin
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Re: Charging issues
ryanhewitt #1187141 Mon Oct 17 2016 04:34 PM
Joined: Feb 2004
Posts: 20,549
H
Boltergeist
My father had a saying- - - -"Getting repair work at a service station is like getting brain surgery at a drug store!" In the same general train of thought, getting electrical diagnosis from some computer jockey at a parts store makes just as much sense. Find someone who can follow a wiring diagram and see if all the circuits are intact. Use a wiring diagram for a late-1960's or early 1970's GM vehicle with the "Delcotron" external-regulated alternator, and duplicate the circuits exactly.

Converting to an internal-regulated 10-SI alternator would be a far better choice.
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: Charging issues
ryanhewitt #1187188 Mon Oct 17 2016 11:29 PM
Joined: May 2005
Posts: 1,635
B
Shop Shark
A 10 SI cost around $40.00 with core around here. To get a running truck for $40.00 ain't bad. BUT, as Jerry stated. Your problems very well my run deeper and a knowing 'set of eyes' would help. Reach out to that electrical guru down the block.


Six volt guy living in a twelve volt world
Re: Charging issues
ryanhewitt #1187294 Tue Oct 18 2016 03:57 PM
Joined: Aug 2015
Posts: 19
R
New Guy
Thank you guys for the info. Always good stuff here. I think I'll go with a one wire. Going to see if the place I purchased the alternator will work with me on a swap. I really don't know anyone with the knowledge I need to fix the current setup, running a 3 wire with diode/light is more work than the one wire. I know there are pros and cons to 1 vs 3...

Thanks again.

Ryan

Re: Charging issues
ryanhewitt #1187313 Tue Oct 18 2016 06:00 PM
Joined: Dec 2006
Posts: 1,154
W
Shop Shark
Take a look at Fifth Ave. Garage Randy Rundle is an alternator guru. He carries 6 and 12 volt and with his alternators you don't need to rev your engine to get them charging. Plus he's a great guy to deal with! Lots of great info on his site.
Steve


Re: Charging issues
ryanhewitt #1187620 Thu Oct 20 2016 04:01 PM
Joined: Aug 2015
Posts: 19
R
New Guy
Parts store swapped me for a 1 wire straight across. Truck is charging at 14.68 at the alternator.

Hopefully this fixes it. Thanks again for all the info.

Ryan

Re: Charging issues
ryanhewitt #1187688 Fri Oct 21 2016 04:05 AM
Joined: Feb 2004
Posts: 20,549
H
Boltergeist
Check the battery terminal voltage, not at the alternator. With good connections and the right gauge wire, you should see 14.5 or better against a fully charged battery, less if the battery is low.
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: Charging issues
ryanhewitt #1188964 Mon Oct 31 2016 06:34 PM
Joined: Mar 2002
Posts: 9,008
Master Gabster
Can you put the old wide generator pulley on that 10SI?


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Re: Charging issues
ryanhewitt #1190243 Wed Nov 09 2016 02:32 AM
Joined: Feb 2004
Posts: 20,549
H
Boltergeist
There are pulleys available for tractors that run the wide belt. Check Ebay for "wide belt alternator pulley". It's a quick swap with an impact wrench- - - -no Woodruff key, just a friction fit.
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!

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