diff --git a/doc/changelog.d/1947.fixed.md b/doc/changelog.d/1947.fixed.md
new file mode 100644
index 0000000000..2ebcee4fa1
--- /dev/null
+++ b/doc/changelog.d/1947.fixed.md
@@ -0,0 +1 @@
+Issue #1063 fixed source to ground
diff --git a/src/pyedb/dotnet/database/sim_setup_data/data/siw_dc_ir_settings.py b/src/pyedb/dotnet/database/sim_setup_data/data/siw_dc_ir_settings.py
index 19a099e7ce..7c4e3580d4 100644
--- a/src/pyedb/dotnet/database/sim_setup_data/data/siw_dc_ir_settings.py
+++ b/src/pyedb/dotnet/database/sim_setup_data/data/siw_dc_ir_settings.py
@@ -21,7 +21,6 @@
 # SOFTWARE.
 
 from pyedb.dotnet.database.general import (
-    convert_netdict_to_pydict,
     convert_pydict_to_netdict,
 )
 from pyedb.misc.decorators import deprecated_property
@@ -241,8 +240,9 @@ def source_terms_to_ground(self):
                 str: source name,
                 int: node to ground pairs, 0 (unspecified), 1 (negative), 2 (positive) .
         """
-        temp = self._parent.get_sim_setup_info.simulation_settings.DCIRSettings.SourceTermsToGround
-        return convert_netdict_to_pydict(temp)
+        temp = dict(self._parent.get_sim_setup_info.simulation_settings.DCIRSettings.SourceTermsToGround)
+        temp = {name.strip("'"): node for name, node in temp.items()}  # strip single quotes from the source names
+        return temp
 
     @source_terms_to_ground.setter
     def source_terms_to_ground(self, value):
diff --git a/src/pyedb/dotnet/database/utilities/siwave_simulation_setup.py b/src/pyedb/dotnet/database/utilities/siwave_simulation_setup.py
index 5ad39cb082..c5f0d52bd3 100644
--- a/src/pyedb/dotnet/database/utilities/siwave_simulation_setup.py
+++ b/src/pyedb/dotnet/database/utilities/siwave_simulation_setup.py
@@ -22,7 +22,6 @@
 import warnings
 
 from pyedb.dotnet.database.general import (
-    convert_netdict_to_pydict,
     convert_pydict_to_netdict,
 )
 from pyedb.dotnet.database.sim_setup_data.data.sim_setup_info import SimSetupInfo
@@ -245,7 +244,7 @@ def via_report_path(self) -> str:
     def via_report_path(self, value: str):
         self.dc_ir.via_report_path = value
 
-    def add_source_terminal_to_ground(self, source_name, terminal=0):
+    def add_source_terminal_to_ground(self, source_name, terminal=0) -> None:
         """Add a source terminal to ground.
 
         Parameters
@@ -261,13 +260,11 @@ def add_source_terminal_to_ground(self, source_name, terminal=0):
 
         Returns
         -------
-        bool
-
+        None
         """
         terminals = self.dc_ir.source_terms_to_ground
         terminals[source_name] = terminal
-        self._sim_setup_info.simulation_settings.DCIRSettings.SourceTermsToGround = convert_pydict_to_netdict(terminals)
-        return self._update_setup()
+        self.dc_ir.source_terms_to_ground = terminals
 
 
 class SIwaveSimulationSetup(SimulationSetup):
diff --git a/src/pyedb/grpc/database/simulation_setup/siwave_dcir_settings.py b/src/pyedb/grpc/database/simulation_setup/siwave_dcir_settings.py
index 3832bdf4d1..2d44dd3770 100644
--- a/src/pyedb/grpc/database/simulation_setup/siwave_dcir_settings.py
+++ b/src/pyedb/grpc/database/simulation_setup/siwave_dcir_settings.py
@@ -192,6 +192,20 @@ def per_pin_use_pin_format(self) -> bool:
     def per_pin_use_pin_format(self, value):
         self.core.per_pin_use_pin_format = value
 
+    def add_source_terminal_to_ground(self, source_name: str, terminal: int = 1) -> None:
+        """Add source terminal to ground mapping.
+
+        Parameters
+        ----------
+        source_name : str
+            Source terminal name.
+        terminal : int
+            The terminal number to reference. `0` set the positive terminal `1` set the negative terminal as reference.
+            Default is `1`
+        """
+        temp = {source_name: terminal}
+        self.source_terms_to_ground = {**self.source_terms_to_ground, **temp}
+
     @property
     def source_terms_to_ground(self) -> dict[str, int]:
         """Source terms to ground mapping.
diff --git a/tests/system/test_edb.py b/tests/system/test_edb.py
index 8490a7411c..995fb2dcf8 100644
--- a/tests/system/test_edb.py
+++ b/tests/system/test_edb.py
@@ -100,6 +100,13 @@ def test_siwave_create_voltage_source(self):
         term2 = u6.pins["F1"].get_terminal(create_new_terminal=True)
         voltage_source = edbapp.create_voltage_source(terminal=term1, ref_terminal=term2)
         assert not voltage_source.is_null
+        # testing source to ground assignment
+        setup = edbapp.siwave.add_siwave_dc_analysis(name="Test_dc")
+        setup.settings.add_source_terminal_to_ground("Vsource_U1_USB3_D_P_U1_GND", 1)
+        if edbapp.grpc:
+            assert "Vsource_U1_USB3_D_P_U1_GND" in setup.settings.dc.source_terms_to_ground
+        else:
+            assert "Vsource_U1_USB3_D_P_U1_GND" in setup.settings.dc_ir.source_terms_to_ground
         edbapp.close(terminate_rpc_session=False)
 
     def test_siwave_create_current_source(self):