My otherwise faithful Balmar Alternator and external regulator recently sound as if they’re revving-up
and then down. Two to four seconds
pass, then it reoccurs. The sound corresponds with:
- · The battery voltage moving up and down
- · A green light flash on the regulator (May not be 100% correlation).
- · A Tachometer that waves at me.
These used sailboat symptoms appear less noticeable while under load and after the
engine runs for a few hours. Both devices are quite old but I don’t have
dates. They didn’t always make this sound. The alternator belt
is in good condition and doesn’t appear to slip.
Questions:
- What would cause this?
- Are my Batteries at risk?
- The alternator is charging a bus which is connected to three different banks is that an issue?
I
look forward to posting my solution soon.
Measurement Details and Pictures Below:
Engine Run time
(.3=30 sec)
|
Battery
|
Measurement tool
|
Low Voltage
|
High Voltage
|
Delta in volts
|
Off
|
Starter
|
Volt Meter
|
12.4
|
NA
|
NA
|
Off
|
Starter
|
Gauge
|
12.7
|
NA
|
NA
|
Off
|
House
|
Volt Meter
|
12.9
|
NA
|
NA
|
Off
|
House
|
Energy Monitor
|
12.96
|
NA
|
NA
|
Off
|
House
|
Gauge
|
13.2
|
NA
|
NA
|
Off
|
Regulator- Blk&Red
|
Volt Meter
|
12.9
|
NA
|
NA
|
0.3
|
Starter
|
Gauge
|
13.5
|
15
|
1.5
|
0.5
|
House
|
Gauge
|
14.5
|
15
|
0.5
|
2.4
|
Starter
|
Volt Meter
|
13.2
|
13.8
|
0.6
|
3.5
|
House
|
Volt Meter
|
13.9
|
14.3
|
0.4
|
4.57
|
Regulator- Blk&Red
|
Volt Meter
|
13.8
|
14.2
|
0.4
|
14.36
|
House
|
Gauge
|
13.6
|
15
|
1.4
|
15
|
House
|
Energy Monitor
|
14.1
|
14.5
|
0.4
|
17
|
Starter
|
Volt Meter
|
13.1
|
14.6
|
1.5
|
18
|
House
|
Volt Meter
|
14.1
|
14.3
|
0.2
|