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wiring
http://www.vems.hu/files/GolfGtiLpg/bekotes.xls schematic |
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See MembersPage/DamirMuha/LPG : for a simpler solution: switching the +12V side (either to power all the LPG or all the petrol) with a switching type relay. Why does this solution switch the low-side with so many relays ? * is the 4 relays to make sure the flyback path is always "complete" ? In the worst case, the following seems to also provide that: ** LPG shared+ ..... relay1 for LPG .... flyback node .... "fuelrelay" .... +12V ** petrol shared+ ... relay2 for petrol .......| ** But that might be overcautios, Damir Muha's solution is known to work on plenty of installs. The "fuelrelay" can be same as fuelpump relay (or, if high currents justify: a relay enabled by the fuelpump relay). |