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89 240 parts for an 87 240 200

posted by  someone claiming to be sorenson-jr on  Thu Sep 7 09:33 CST 2006 [RELATED]

By under load I mean the entire circuit, not just the relay. But if there is any red herring here it is mine, as lucid is correct to point out your ignition diagnostics would not work without a good circuit through the fuse. The idea of testing something under load is to see if it will carry the current it is supposed to. If you merely check continuity or the presence of voltage without the circuit fully in use, you might in many circumstances conclude it is OK when it can't support the current actually needed by the load. Still, it is better than nothing.

I am probably too optimistic your ECU is not the trouble, but lucid's comment above lessens the chances for it. I checked on my 90 sedan; he is right, if I pull the blade fuse neither diagnostic works. There is yet a chance the wire to the diag box is corroded up there where it enters the box. That is exposed somewhat to weather. You can pull the plug off the bottom and look at it.






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