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From: johngdole on 8 Sep 2007 12:19
Yeah, 2v drop from battery to the (B) wire on the IGN SW is way too
much. There should be <0.1v across each connection hopefully. And this
is measured with a digital volt meter available for loan (free but
with deposit) at Autozone.

The 88 diagram is not too detailed on where the (B) wire leads. Maybe
someone else with more detailed 88 diagram can help. According to
Haynes, the later IGN SW goes upstream through a junction block and
then the 30A AM2 fuse, connects directly to the upstream side of the
100A ALT fuse link, to the MAIN fuse link, and then to the battery.

Additional reference for those who need to do the test, I came across
this article on voltage drop test:
http://www.aa1car.com/library/voltage_drop_testing.htm


On Sep 8, 4:15 am, geronimo <Jam...(a)grandecom.net> wrote:
> Again, I have already eliminated the ign switch as the culprit, there
> is NO appreciable voltage being dropped across the ign switch. The
> drop is occuring somewhere downstream from battery and upstream from
> the ign switch. It is BRN B-wire on input, and Black/white going out
> to safety switch as you said....from there to control wire. During
> cranking there is 0 volts across the ign contacts. The voltage is
> being pulled down by resistance ahead of the ign switch towards the
> battery. I have already jumpered around the safety switch, still had
> same problem. I initially thought that might be where the voltage drop
> was.
> I am thinking that there must be an internal relay in this
> starter, as the wire going to control relay is only abt 20 gauge.
> It would never handle 200-400 amps! This is is a new starter from
> Autozone.....a new starter wasn't the fix either!
> There are three fuses mounted right on the pos terminal of
> batttery, but none of the four wires are solid BRN. There is
> something wrong with the middle 60 amp fuse, as it will not pull out,
> so I am going to investigate this today. But since the starter
> control wire pwr. doesn't go to the battery directly, problem is not
> at those fuses.
>
> Geronimo

From: mred on 9 Sep 2007 07:50
On Sep 8, 12:19 pm, johngd...(a)hotmail.com wrote:
> Yeah, 2v drop from battery to the (B) wire on the IGN SW is way too
> much. There should be <0.1v across each connection hopefully. And this
> is measured with a digital volt meter available for loan (free but
> with deposit) at Autozone.
>
> The 88 diagram is not too detailed on where the (B) wire leads. Maybe
> someone else with more detailed 88 diagram can help. According to
> Haynes, the later IGN SW goes upstream through a junction block and
> then the 30A AM2 fuse, connects directly to the upstream side of the
> 100A ALT fuse link, to the MAIN fuse link, and then to the battery.
>
> Additional reference for those who need to do the test, I came across
> this article on voltage drop test:
> http://www.aa1car.com/library/voltage_drop_testing.htm
>
> On Sep 8, 4:15 am, geronimo <Jam...(a)grandecom.net> wrote:
>
>
>
> > Again, I have already eliminated the ign switch as the culprit, there
> > is NO appreciable voltage being dropped across the ign switch. The
> > drop is occuring somewhere downstream from battery and upstream from
> > the ign switch. It is BRN B-wire on input, and Black/white going out
> > to safety switch as you said....from there to control wire. During
> > cranking there is 0 volts across the ign contacts. The voltage is
> > being pulled down by resistance ahead of the ign switch towards the
> > battery. I have already jumpered around the safety switch, still had
> > same problem. I initially thought that might be where the voltage drop
> > was.
> > I am thinking that there must be an internal relay in this
> > starter, as the wire going to control relay is only abt 20 gauge.
> > It would never handle 200-400 amps! This is is a new starter from
> > Autozone.....a new starter wasn't the fix either!
> > There are three fuses mounted right on the pos terminal of
> > batttery, but none of the four wires are solid BRN. There is
> > something wrong with the middle 60 amp fuse, as it will not pull out,
> > so I am going to investigate this today. But since the starter
> > control wire pwr. doesn't go to the battery directly, problem is not
> > at those fuses.
>
> > Geronimo- Hide quoted text -
>
> - Show quoted text -

>From reading all the good advice on here and from what the problem
is ? Has anyone thought to check for poor ground wire connections ?
almost sounds to me like a corroded connection ?

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