On Sat, 28 Sep 2019 16:21:59 -0500, Terry Coombs
wrote:

On 9/28/2019 3:30 PM, Clare Snyder wrote:
On Sat, 28 Sep 2019 14:04:51 -0500, Terry Coombs
wrote:

On 9/28/2019 1:05 PM, Clare Snyder wrote:
On Sat, 28 Sep 2019 00:11:39 -0400, Clare Snyder
wrote:

On Thu, 26 Sep 2019 20:58:14 -0500, Terry Coombs
wrote:

* Someone posted a link to the GM shop manual , which indicates that
the radio is NOT alone on that fuse circuit . I'm sure about some items
, but don't know what/where the time delay relay and emission control
solenoid are ... I figured with your history you might be able to help
me figure it out . I'm assuming both are part of the emissions stuff -
most of which has been long since removed .
Year, engine and transmission again? Emission control solenoid
sounds like canister vent solenoid?? The only time delay relay in the
engine system I can think of was for transmission controlled spark
system in the early seventies - (70-71 without A.I.R.)

The only "time delay relay" I can thinkof in a 1986 vehicle would be
in the wiper system - intermittent wiper relay.

The evap control solenoid valve is back on the evap canister above the
back of the muffler somewhere. The wire back to the evap solenoid
could very well be chaffed through anywhere between the fuse box and
the back of the truck - again I would check the wiring harness in the
area of the replaced transmission first.
The 700R has a lockupo converter.
The lockup power comes from an Acc power plug right above the RDO fuse
(radio) and is a brown and white wire in a brown plug. Disconnect that
brown plug and see what happens. Not an uncommon problem -
particularly if some hamfisted hillbilly wrench changed the
transmission - - - - - - That "acc" plug is powered by the 15 amp
radio fuse.
* Well , it's definite now that the fault is in the wiring . I left the
radio out , the fuse was blown when I got to town . That lockup wire
will be on the connector that hooks to the trams along with the backup
light switch etc ? FWIW the hamfisted HACK that installed it is my son .
He definitely ain't a hillbilly ... he's a flat-lander ! And he's for
sure a hack , couldn't be bothered to actually finish the installation
by changing out the speedo drive . I wonder if I can check that with my
digital meter . Leave the fuse out , set it on beep and run the truck up
to highway speed . If that's it it should start beeping when the trans
lockup is supposed to engage . That would also explain (at least
partially) the lousy mileage it's getting and the fuse not blowing until
I'm on the highway . Is there a cure for this problem that will keep the
lockup functional ?
*I really appreciate your help with this , it's been running me in
circles . Gettin' nothing but dizzy trying to figure it out .
Easier - just disconnect the brown connector at the fuse panel and if
it doesn't blow the fuse you KNOW where to look. I've seen the harness
toasted on the exhaust manifold - and pinched between the engine and
bell-housing - - as well as left hanging loose. The lockup solenoid is
just ahead of the accumulator housing on the left rear of the trans
case between the 1st and second pan screws forward of the left rear
corner.

* It appears that you have nailed the problem ! I unplugged the brn/wht
wire at the fuse block and took a ride down the highway . I still have
power at the radio connection ... tomorrow I get under there and figure
out where it's grounding out . I suspect that my gas mileage will
improve after this is repaired - the boy did mention the lousy mileage
he was getting , and it did seem like I burned more gas than I used to
between Memphis and home . Two birds with one stone this time . I would
NEVER have discovered this without your help , and I thank you .
There is a way to wire up the converter lock using a pressure
switch, a manual switch and a relay so it automatically locks when in
4th IF you tell it to - and will not lock in any other gear. It
involves removing the 4th gear servo cover and drilling and tapping it
for the pressure switch and wiring it so the relay only turns on when
the switch senses pressure on the high servo - if the harness is too
badly mangled and the control circuitry damaged - but it APPEARS the
control circuitry is still working.

I'll be off-line for almost 3 weeks starting Monday afternoon - so if
you need more info you'll need to "get crackin'".

Takin the little woman to Italy and on a cruise along with 3 other
couples - all long-time friends.