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

DId you mean make a jumper between '30' and '87'?  There is no 37,
80.  the relay got warm when I last gave the car a go.  Hope I
didn't fry anything.

The inertia switch looks fine in regards to a visual scan.  No
corosion or faulty wiring. the plunger slides well and it even looks
somewhat new.  I think I'm killing my battery though because
everything is sounding really weak.  I guess I need to re-charge
it.  But I check the voltage and it holds at 11.8 which shold be
enough to at least get it going right?

I think it may be time to get a proffessional because I'm starting
to get over my head with this!!


--- In DMCForum@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> 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
> pump, then clip the other one to the black/purple contact on the
> intertia switch plug. If it reads "open" your fuel pump is
> 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
> 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
> Lastly, (regarding the inertia switch) remove and inspect the
> 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
> sure it's operating properly. Plunger down= short. Plunger up=
> This is the correct mode of operation.
> I'm really pushing this grounding issue because you jumpered your
> relay and still only had 00.00 volts (flashing 7v). That clears
> 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
> 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
> 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.
> seat belt mounting bolts make a good ground I think. You're
> the flow, finding the break in the pipe.
> Electricity is just plumbing. Electrons flow instead of water and
> pipes are really tiny.
> Post your findings when you can.
> Rich A.
> #5335
> --- In DMCForum@xxxxxxxxxxxxxxx, "Brian" <TK581@xxxx> wrote:
> > > Ok, two or three people have told you where the interia switch
> >
> > What exactly am I supposed to check here?  It's pluged in and
> a
> > black box... :)
> <snip!>

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