Schematic
SOURCE: somewhere on the Internet
If you have an electric start model with a 12v battery in it, then it already has a rectifier/regulator and you can wire right
off the battery. If not, you'll need to put in a rectifier (4 diodes) with a large capacitor and a voltage regulator (7812) circuit
to power the GPS. Then you can put a set of lithium batteries in the GPS as a cold weather backup to the hard wired power supply...
in the event that your sled dies and you have to walk home.
| Part | Part Number | Part Description (from Radio Shack) | Price |
| IC1 | 276-1161A | Silicon Bridge Rectifier 200V 1A | $0.99 |
| IC2 | 276-1771A | 7812 12VDC Voltage Regulator | $1.49 |
| C1,C2 | 272-1044 | 100 uF 50W Capacitor | $1.19 |
| C3 | 272-135 | 0.1 uF 50W Capacitor | $0.69 |
| C4,C5 | 272-1070 | 0.22 uF 50W Capacitor | $0.89 (pkg of 2) |
| D1 | 276-564 | 15V Zener Diode | $0.99 |
| | 270-283A | Project Enclosure w/ PC Board | $1.49 |
| | 270-026 | DC Accessory Cable | $1.49 |
| | 270-1211 | Fuse Holder | $1.49 |
| | 270-1003 | 1/2 Amp Fuse | $1.29 (pkg of 4) |
| | Total Cost: | $12 |