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Chattering Fuel Pump Relay 200 1984

uid 18083's pic
posted by  lucid on  Thu Jan 6 02:59 CST 2005
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

The 25 amp fuse itself may be OK, but carefully examine both ends of the 2 wires connected to it. Although that fuse feeds through the relay, it is not involved in the relay's operation, so I don't think it is causing the chatter

The Chattering is caused by low voltage — enough to energize the relay coil, but when the points close, the load (fuel pumps) is more than can be handled, so the relay drops out. The cycle repeats rapidly, causing chatter or buzzing relay.

So you should also check fuse contacts for #13, which powers the fuel relay COIL (Blue/Red wire on terminal #85). The fuse (along with 11 and 12) gets power on the hot side via a Blue/Yellow wire from the ignition switch.

The Ignition Switch gets power from the small black plastic terminal block on the fender rail, near the battery.
--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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