13.8 on battery vs 14.5 on alt output

[rdstudio]

Hello!

So today Ive noticed that I have lower battery charging voltage (13.8) than alternator voltage output (14.5).
When on idle, battery voltage sometimes drop to 12.9 (not sure what was on alt output at this time)

Also my amp meter is sometimes show value below 0, and my interior lights pulses a bit when on idle or reving engine.

Should I check VR first? I have mechanical style.

Notice for VR photo - I have electric choke connected to field port of VR - should I switch it to balast output? I disconnected electric choke today but this do not increased battery voltage while charging.

 

[AR67GTX]

I would be very suspicious of the choke power lead connected to the field side of your regulator. I would switch it to the 12.8 volt side of the ballast. It might be your problem and it might not.

 

[rdstudio]

I also wanted to make full field test - but I'm not sure if I should connect field from alt to ground of battery (-) or field from alt to output of alt (+).

 

[pnora]

Get that wire off the regulator. Find a proper 12 volt key on source.

 

[Nacho-RT74]

Get that wire off the regulator. Find a proper 12 volt key on source.

Can be sourced from reg bug on the other side. Not at FIELD terminal but at IGN terminal

 

[451Mopar]

The regulator Field only goes to the alternator, nothing else. A search or list of Similar Threads below should have more info on charging related issues.

 

[R/T Boy 67]

The problem is probably in the bulkhead connector. Run a jumper wire from the hot terminal on the alternator directly to the battery positive terminal, and see if the battery voltage comes up.

 

[rdstudio]

The problem is probably in the bulkhead connector. Run a jumper wire from the hot terminal on the alternator directly to the battery positive terminal, and see if the battery voltage comes up.

will do thanks

 

[BB69R/T]

You can also check for voltage drop seperately (both on the + and - side) between each component in the charging system. in your case between the batter and alternator. There are numerous tutorials on you tube (with value specifications) for this as well as a host of video lessons on the website MyMopar. I had a siimilar problem of voltage drop between my battery and alternator on on the positive and as I traced the the circuit the first stop was the starter relay. the mounting bolt was loose, and after tightnening my numbers have been good. I get a solid 13.5 volts on my aftermarket voltmeter I added , plus my ammeter fluctuates about a needle or two widths to the right of C. Hope this helps.. Good Luck.. 69 Coronet R/T