12.4 charge driving. Replace alternator?

[bm02tj]

Most electronic regulator are temperature compensating as the colder the higher the voltage and
when hot it is lower to protect the battery
not like the old days when you had to run your headlight on a hot summer day to save your battery
You also need to take voltage where you have no line loss not at end with a load

 

[Billccm]

I'll add a few more details here, but I still believe there is nothing wrong with Dennis's car.

The voltage regulator was relocated to the driver's side of the wiper motor. One of those scotchlok terminals was added to the Field(+)/IGN pin of the regulator and is connected to the EFI module. The EFI module is mounted where the regulator used to be mounted.

The EFI Tablet seems to read on the low side and bounces on occasion towards lower voltage readings. I noticed on one occasion the battery voltage was rock solid stable and the EFI Tablet measurements were bouncing 0.2 to 0.4V low.

Probably adding more info then you want to read, but there is no sensor element in the EFI. More than likely there is a single ADC (analog digital converter). I 'assume' this single ADC is multiplexed to read temp, TPS, voltage, etc and hence there is some bounce. This is one of those 'fuzzy logic' things where judgement calls are needed. There could be some small AC from the alternator that causes the ADC bounce, who knows?

I still say it ain't broke, so don't fix it.

 

[kiwigtx]

Calling @Dennis H ...watch this video of mine...skip to 4:40 if you feel like it
You can see my display showing the battery volts and temperature....voltage drops slowly as temperature increases.



Will do more checks for you later as a comparison.

 

[Loulang]

Calling @Dennis H ...watch this video of mine...skip to 4:40 if you feel like it
You can see my display showing the battery volts and temperature....voltage drops slowly as temperature increases.
Ever figure out why voltage drops? Mine is doing the same thing


Will do more checks for you later as a comparison.

 

[RJRENTON]

Take a meter and go across the battery terminals and measure. Your readout circuit location is unknown.

Yes....how or where does the digital display derive its input data? It's possible that it gets its information from a switched source, like the ignition switch or some other down stream point that may be subject an indirect or inaccurate reference point. As suggested, measure directly at the battery, using digital volt meter or an analog meter like a Simpson 260 or Tripplet 630....if higher voltage is displayed at the battery connection, the lower digital display reading connection, or reference point, is inaccurate, possibility due to a corroded connection. Just my opinion of course...
BOB RENTON