[DMCForum] Re: very frustrated!! - starting problem
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[DMCForum] Re: very frustrated!! - starting problem

Ah, good question. Sorry :)

At the inertia switch, you need to do a "continuity" check. The
ground wire from the fuel pump is black/purple, it goes to the
intertia switch. Clip one ohm meter probe to the ground wire on the
pump, then clip the other one to the black/purple contact on the
intertia switch plug. If it reads "open" your fuel pump is grounded
elsewhere and you need to find it. It's probably fallen off. If it
reads "short" then the b/p wire is attached to the harness as it
should be.

Also, inspect the BLACK wire on the inertia switch plug to make sure
it's grounded properly. Just touch the one probe to the black wire
contact and the other probe to the body or frame somewhere. Again,
short=good, open/resistance=bad. If the pump is grounded at the
switch but the -switch- ain't grounded you'll still have the problem.

Lastly, (regarding the inertia switch) remove and inspect the black
box. Look at the contacts. Is the plastic melted around them? The
older style were a point of failure. They were underrated. You can
also put your ohm meter on the contacts and pull the plunger to make
sure it's operating properly. Plunger down= short. Plunger up= open.
This is the correct mode of operation.

I'm really pushing this grounding issue because you jumpered your RPM
relay and still only had 00.00 volts (flashing 7v). That clears the
relay from the problem. BTW, I think your jumper was probably fine.

Oh hell, I just remembered. DeLoreans use the European habit of
switching grounds on and off, not power. Definitely follow the steps
above, but also jumper the RPM relay again, and measure for 12v on
the white/purple wire but do it with a ground OTHER than the ground
wire on the pump. Use the body or frame somewhere.

If you have no voltage, go back to the inertia switch and touch
white/purple, and an independent ground again. (Frame/body).

If you have no voltage THERE, go back to the RPM relay and do it
again! Unplug the relay and touch W/P and an independent ground. The
seat belt mounting bolts make a good ground I think. You're tracing
the flow, finding the break in the pipe.

Electricity is just plumbing. Electrons flow instead of water and the
pipes are really tiny.

Post your findings when you can.

Rich A.

--- In DMCForum@xxxxxxxxxxxxxxx, "Brian" <TK581@xxxx> wrote:
> > Ok, two or three people have told you where the interia switch is.
> What exactly am I supposed to check here?  It's pluged in and it's
> black box... :)

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