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Maximum Voltage from R/R

  • Thread starter Thread starter Gravity Tester
  • Start date Start date
G

Gravity Tester

Guest
OK guys this is a simple one but I dont know where to look all I see from searches is what there's is putting out.

Replaced the R/R Today at idle 14.7vdc down to 13.5 at 5k or greater is this a little high or still in spec?

Pat
 
The voltage is dropping as the rpm goes up? If it's the other way around then things are fine, but what you are describing is odd.
 
Sounds like you have some cleaning to do. As the voltage increases, the heat will also increase, creating more resistance in your wires, causing the voltage to drop. If there is a bad connection(s) or corrosion anywhere, it will compound the problem. I had this same situation as well, but then went thru and cut off and added connectors to fresh CLEAN wire, and it settled down..
 
Sounds like you have some cleaning to do. As the voltage increases, the heat will also increase, creating more resistance in your wires, causing the voltage to drop. If there is a bad connection(s) or corrosion anywhere, it will compound the problem. I had this same situation as well, but then went thru and cut off and added connectors to fresh CLEAN wire, and it settled down..
Click to expand...

Josh,
I think that is close but it is more to do with the change in current between idle and 4K. From my experience it is typically corrosion and connections in a fuse box. At idle there is little excess current to go from the R/R to the battery. As the RPM increase so does the current output and when that current is pushed through a resistance the voltage at the battery drops. This is why I always recommend measuring the voltage drops be ween ground and positives on battery and R/R.

The only other thing is assuming the measurements are as stated is that the R/R is not regulating. So we likely have two problems 1.) poor connection from R/R to battery and 2.) lack of R/R regulation.

Pos
 
I'd give it a bit more running time. Go ahead and check all the connections anyway because you should but if it is above 13.2 then technically you are in the proper range.
 
duaneage said:
I'd give it a bit more running time. Go ahead and check all the connections anyway because you should but if it is above 13.2 then technically you are in the proper range.
Click to expand...

Is 14.7 too high at the battery ?
I understand about the connections but I figured the voltage drop came into play as the R/R senced increased Current thus less voltage .
 
Last edited:
Gravity Tester said:
Is 14.7 too high at the battery ?
I understand about the connections but I figured the voltage drop came into play as the R/R senced increased Current thus less voltage .
Click to expand...
14.7 should be okay. Once you start getting closer to 15 things start becoming suspect.
 
Gravity Tester said:
Is 14.7 too high at the battery ?
Click to expand...
That can depend on the type of battery that you have installed.

For the typical wet-cell battery, the 'ideal' voltage will be between 13.8 and 14.1.
Some of the "low-maintenance batteries can go a little higher to 14.4.
The sealed AGM batteries (that's a construction type, not a brand name) prefer a higher voltage and 14.7 will be near perfect.

.
 
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