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^{simulate this circuit – Schematic created using CircuitLab}

I think there are too many problems with your present config.

options:

1. Battery charger design 14.2V + motorcycle battery, stable, most power
2. LM317 with bypass
3. DCDC regulator to 1V above a linear power regulator, More efficient, less heat rise.
4. DCDC regulator to meet or exceed all above requirements. Most efficient, quiet like PC power supplies.

modified Option 2.

Won't work
Input is too low and needs 20V with 1 ohm drop @ 6A for 14.2 out

Option 2 needs a rugged FET to handle linear failure modes using LM317 (search site for details)

Best bang for the buck

Option 1 using Option 2 with thermal protection (both FET and LM317 mounted to same heatsink. Car batteries have very low ESR thus can be regulated well at high step currents.

https://www.pinterest.ca/pin/618611698800362777

^{simulate this circuit – Schematic created using CircuitLab}

I think there are too many problems with your present config.

options:

1. Battery charger design 14.2V + motorcycle battery, stable, most power
2. LM317 with bypass
3. DCDC regulator to 1V above a linear power regulator, More efficient, less heat rise.
4. DCDC regulator to meet or exceed all above requirements. Most efficient, quiet like PC power supplies.

modified Option 2.

Won't work
Input is too low and needs 20V with 1 ohm drop @ 6A for 14.2 out

Option 2 needs a rugged FET to handle linear failure modes using LM317 (search site for details)

Best bang for the buck

Option 1 using Option 2 with thermal protection (both FET and LM317 mounted to same heatsink. Car batteries have very low ESR thus can be regulated well at high step currents.

https://www.pinterest.ca/pin/618611698800362777

Future work

https://www.analog.com/en/design-center/design-tools-and-calculators/power-management-tools.html LTPowerCAD

^{simulate this circuit – Schematic created using CircuitLab}

I think there are too many problems with your present config.

options:

1. Battery charger design 14.2V + motorcycle battery, stable, most power
2. LM317 with bypass
3. DCDC regulator to 1V above a linear power regulator, More efficient, less heat rise.
4. DCDC regulator to meet or exceed all above requirements. Most efficient, quiet like PC power supplies.

modified Option 2.

Won't work
Input is too low and needs 20V with 1 ohm drop @ 6A for 14.2 out

Option 2 needs a rugged FET to handle linear failure modes using LM317 (search site for details)

htps://www.pinterest.ca/pin/618611698800362777

^{simulate this circuit – Schematic created using CircuitLab}

I think there are too many problems with your present config.

options:

1. Battery charger design 14.2V + motorcycle battery, stable, most power
2. LM317 with bypass
3. DCDC regulator to 1V above a linear power regulator, More efficient, less heat rise.
4. DCDC regulator to meet or exceed all above requirements. Most efficient, quiet like PC power supplies.

modified Option 2.

Won't work
Input is too low and needs 20V with 1 ohm drop @ 6A for 14.2 out

Option 2 needs a rugged FET to handle linear failure modes using LM317 (search site for details)

Best bang for the buck

Option 1 using Option 2 with thermal protection (both FET and LM317 mounted to same heatsink. Car batteries have very low ESR thus can be regulated well at high step currents.

https://www.pinterest.ca/pin/618611698800362777

^{simulate this circuit – Schematic created using CircuitLab}

I think there are too many problems with your present config.

options:

1. Battery charger design 14.2V + motorcycle battery, stable, most power
2. LM317 with bypass
3. DCDC regulator to 1V above a linear power regulator, More efficient, less heat rise.
4. DCDC regulator to meet or exceed all above requirements. Most efficient, quiet like PC power supplies.

Option 2.

https://www.pinterest.ca/pin/618611698800362777

^{simulate this circuit – Schematic created using CircuitLab}

I think there are too many problems with your present config.

options:

1. Battery charger design 14.2V + motorcycle battery, stable, most power
2. LM317 with bypass
3. DCDC regulator to 1V above a linear power regulator, More efficient, less heat rise.
4. DCDC regulator to meet or exceed all above requirements. Most efficient, quiet like PC power supplies.

modified Option 2.

Won't work
Input is too low and needs 20V with 1 ohm drop @ 6A for 14.2 out

Option 2 needs a rugged FET to handle linear failure modes using LM317 (search site for details)

htps://www.pinterest.ca/pin/618611698800362777