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Dave! You are absolutely right here. An oscilloscope i needed to messure the transients and would of course be done before and after fitting of the varistor or diode just to make the right decision of parts. I donīt have an oscilloscope either so we just have to test it by trial and error. Iīm grounded for the moment by the flu so it is not possible for me to make tests for some weeks ahead but I will purchase some diodes 1N4007 to solder one within the relay can (only one diode will be needed......the one over fuel pump). This could be done over the connection flags 85 (ground) and 87b (fuel pump) at the inside of the relay. Relay parts are soldered onto a printed cirquit board so it may be possible to fit the diode or varistor there. A diode should be soldered with the cathode (white ring end) to 87b, the other end to 85 but one should remember NOT to do this on an old relay with already burnt contacts. A new relay is preferred here........or if one is very keen on fiddeling with very small things, it is possible to rub down a minor contact damage with fine sandpaper and clean them with alcohol. Of course it is essential that the relay is in good shape in other parts.
So, it is a pity that we donīt have an oscilloscope. If this will work we have to wait until our cars are scrapped by age.....17 more years or so, then we can say, it DID work LOL.
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Lapponia 1984 944 na
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