Alternator?????69 charger

[mxcharger69]

When i decided to refresh to a newer alternator on my 69 charger 440 i went to my orielly's and got a new one. problem is the new one is a 3 post setup to were the old one was a 2 post set up when i installed the new one and hooked up the output wire (double wire with eyelet) and the other wire to the post on the alternator label FDL(field). When i have my system charging tester hooked up, it shows no charging. Someone i told me to try grounding the 3rd post and i did and it shows it charging but it seems like it my might be too much. Has anyone had to trouble shoot this problem yet??? any help would be appreciated.

brad

[Nacho-RT74]

you got a double field alternator while your original one is single field.

On single field alternator one of brushes is screwed directly on to back of housing getting constant negative/ground source, for a while blue wire what feeds the isolated brush coming from regulator is regulated by an electromechanical relay inside the regulator. More power lost on batt or charging system, more power send regulator to increase magnetic field inside the alternator and get more output on to the big stud ( positive ) and chassis ( negative ) to charge batt.

On double field, power output is regulated by negative/ground variations instead positive. Both brushes are isolated and getting feeded by wires. Blue one ( positive ) comes directly from ignition switch and one green wire ( negative ) what feeds the other brush comes directly from regulator... this regulator is a transistorized one and is the one that increase the negative input ( what takes from chassis ) to increase also internal magnetic field on alt, and also output by the same way that earliers ( stud and chassis ).

if you decide to keep this new alternator you have two options:

One easier and cheap, install a metallic washer on to any of the brushes screws to get ground from chassis and keep it working as your old one, with electromechanical regulator.

And two... upgrade your charging system with a new electronic regulator and running a new wire up to extra alt brush from regulator.

advantages of this late one... better and balanced charging system

advantage of earlier one... you can increase anytime the output from regulator with the screw on it if is equipped, or changing the relay tab setup inside regulator.

Is your choice

I think everybody would go with upgrade.

[Nacho-RT74]

here is a diagram about how are wired both system and what do you need to make the upgrade.


OH AND BY THE WAY, WELCOME TO THE BEST BOARD OF ALL THE CIBERWORLD

[mxcharger69]

hey thanks Nacho-RT74,
thats what i was thinking when i got to looking at the back of the new alternator and notice that both FDL post where insulated from grounding.
new to the mopar world. bought my charger back a few years ago as a hs grad gift, all it was was a shell. but i have been doing the restoration all my self. i have found that the sheet metal work has been the most fun,LOL. i am a very new to the site and already wonder why i haven't been here before. love it here.


MY HAT IS OFF TO THIS BOARD!!!!

Brad

[Nacho-RT74]

don't worry, you REALLY will find lots of help here and even better FRIENDS...

for ourself resto... you can click on my signature to check how everybody of this board have been on same deal... that's my example.

Just an advice... Charging system on Mopars is not the best of the world... needs care and attention...

if you want to keep it safe and your new alt is more powerfull than your old one... some like the lates 70s Alt where stator is almost sealed by the housing, will be better also runs new paralel wires from alt stud up to ammeter, and from there up to starter relay stud with a fuse link, throght the firewall with  a grommet, to save the original wiring and bulhead terminals from the extra load what won't support it. Mopar terminals at bulkhead are weak to excesive loads

[Nacho-RT74]

something like this, where MaMopar had the option to cars with trailer tow package and maybe also some highly optioned cars with lots of electrical parts to carry the extra loads

[01CHARGER]

HI GUYS IM HAVING THE SAME PROBLEM, NOW IF I GO WITH THE NEW VOLT REG OPTION, WILL THAT EFFECT THE LOAD ON THE BULK HEAD OR THE REST OF THE EXISTING WIRING?

[Nacho-RT74]

we are talking about different stuff...

problem on extra loads is really higher output alt itself and/or high consumption electrical devices on car, mosty caused by A/C blower ( talking about stock equipment ).

A constant unbalanced charge ( from C to D on amm and backwards ) will give you excesive loads on old wiring for instants that will give you more power that old wiring and weak terminals aren't able to support.

Change regulator from mechanical to electronic apparently will give you a more constant and balanced output on alt what is. Will get less high peaks on charge load. That doesn't mean mechanicl regulator doesn't works, is just that electronic/transistorized regulators are more quick on response and regulation job.

As stated you can check advantages on every kind of regulator. For example You can't change the regulator output on electronics like on mechanical you are able to do it.

The other problem on Mopars is the charge at iddle problem stuff, what is very common on old Mopars and the real solution is go with smaller pulley or go with a newer alt. If you want stock pieces a late 70s alt is an excelent alt because they have a wider stator, able to capture more magnetic field, and that will give you more charge at sames lows RPMs.

the charge at idlle problem stuff is the other reason to get constant charge peaks that causes stress on charge net.

if you upgrade the charging system with higher output alt, no matter which regulator you goes, to make the wiring upgrade with parallel wires is an excelet option to keep your Mopar like original. I did and I'm very happy with it including running A/C. No more overheats on those points. Only rest ignition switch red wire overheating spot and blower switch problems to save.

I have practically ALL THE TIME amm needle on center with what I did, including with A/C. Only got some minor changes with beams lighted on at night since I have halogen beams. And those changes are on heavy traffic moments.

another option you have is ( I don't like since is modify your Mopar a lot but everyone choose what it wants ) :
http://www.madelectrical.com/electricaltech/amp-gauges.shtml

On that website you see the tipical Mopar weak point on charger system

there is a lot of topics talking about upgrades and stuff on electrical section... in fact I have no doubts moderators will move this topic to that area of board

[BigBlockSam]

WELCOME TO THE BEST BOARD OF ALL THE CIBERWORLD 

[01CHARGER]

I JUST PURCHASED THE NEW ELECTRONIC VOLT REGULATOR AND I HAVE THE ALTERNATOR
BUT HOW DO YOU CONNECT THE WIRES TO THE NEW VOLT REGULATOR? IT LOOKS LIKE IT IS USED FOR A PLUG?

[Nacho-RT74]

you need to buy the plug... I think is available on any parts dealer up there... here in Venezuela it does