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More on the 25A fuse circuit 200 1989

uid 18083's pic
posted by  lucid on  Fri Sep 8 01:36 CST 2006
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

Steve,
Sorensonson-jr's "load testing" comment got me thinking about an incident where that 25A circuit (fuse OK but wire degraded at battery+ terminal) would only pass a small fraction of the required current—easily showing as +12V on a meter at Fuel relay 30, but not enough to handle a "load".

You may not be aware that there are two relays inside that white plastic cover. The Fuel relay of course, but before that can work the Main relay must energize in order to power the ECU and get things started (including the OBD test LED).

For more on this, see my recent response to Sorenson-Jr, where I posed this weak current possibility, and how you can easily check it out.

--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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