In a message dated 98-08-14 12:16:27 EDT, dstauffa@csc.com writes:
> My question to the list is just what could I use? The Bosch pump uses 12
> ga. wires, compared to the 14ga. that feed the original Lucas pump. (The
> Facet uses 14 ga wires). Obviously, I need this circuit to be on only when
> the ignition is on. Safety being a major concern. Is there a way to rig
> something up a the fuse box? Perhaps this may be a way to utilize the
> "spare" slot in my fuse box.
Yes, this would be an excellent use for the spare fuse position. Run a 12
gauge wire from the 4-way junction box (located right next to the fuse box,
with four large spade connectors, fed directly from the battery with a brown
wire - Item No. 23 on your wiring diagram) to the spare fuse position. insert
a 20 amp fuse. Run a wire, 12 ga, from the other side of the fuse to to a
relay (terminal C1 if using a Lucas relay, terminal 30 if using an American or
Bosch relay). From the relay (terminal C2 or 87), run a 12 gauge wire to both
fuel pumps. Insulate and tie back the existing fuel pump wire in your harness.
Run another wire, 14 gauge, from the fuse with the green wires (from the same
side of the fuse as the green wires) to the relay (terminal W1 or 85). Run a
wire from the relay (terminal W2 or 86) to one side of the inertia switch.
Ground the other side of the inertia switch. This is all assuming that the
inertia switch is a simple on-off switch, off when shocked, with no
complications. If anyone knows otherwise, please let me know, and I can revise
this.
Both pumps will now come on and off with the key, both pumps will cut off with
the inertia switch, your wiring is adequate to handle both pumps, and all
pertinent wiring is fused.
> Here's a bonus question: Will my inertia cut-off switch handle the current
> to both fuel pumps?
Wired as above, it doesn't need to. It only has to operate the very low-power
relay coil.
Dan Masters,
Alcoa, TN
'71 TR6---------3000mile/year driver, fully restored
'71 TR6---------undergoing full restoration and Ford 5.0 V8 insertion - see:
http://www.sky.net/~boballen/mg/Masters/
'74 MGBGT---3000mile/year driver, original condition - slated for a V8 soon
'68 MGBGT---organ donor for the '74
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