Re: #618 no start spider

[chris hall <christian147@domain.elided>]

to expand on a no spark no start condition in 82 to 89 Bosch injected
spiders,  the ignition control box is very voltage sensitive.  the wiring
to the box is very convoluted, at least 11 connections from battery to
box none are waterproof, all corrode and can cause excessive voltage
drop.  Check voltage at the box by removing connector to box ( Under rear
package shelf, large box in middle)  cut nylon tie wrap remove small
phillips screw and slide plastic top away from harness. 
Test #1
 Reconnect harness stick positive probe of volt meter into connector slot
for the large green and black wire, ground negative probe and crank
engine.  voltage should be above 10 volts.  If  10 volts go to test #2 If
not run a jumper wire from the battery to the green and black wire( fused
of course) and check for spark (or if it will start) if it will the most
reliable fix is to wire the green and black wire to the main relay. this
is the 20mm cube located under the package shelf beside the inj. and ign.
boxes.  I have always exposed the harness at the right door by pulling
the carpet up and in the middle of the door cut into the plastic harness
cover find the green and black wire( make sure it is the on to the ign..
box ) and cut it.  tape off the forward end and at the ign. box connector
pull the wire out of the harness and reinstall the connector cover. 
remove connector from main relay and remove wire from relay output (
several red wires not hot with relay unplugged) from plastic connector .
strip the green and black wire back about an inch and wrap the back or
the wire connector with it and solder it in place being careful not to
make it so big it will not fit back into the plastic connector . 
reinstall wire connector and reconnect main relay.
Test #2
Pos in green and black wire and Neg. probe in large black wire.  should
be same voltage as test #1 if so problem is not in power or ground
circuit, If not you have a ground problem and a fix could be much like
the fix for test #1 but with the black wire not the green and black wire.
 Install an eyelet on the end of the black wire and mount  with the other
grounds on the floor of the package shelf or under the screw that holds
the main relay.
Other problem areas are in line fuse in wire that feeds the main relay. 
Follow the heavy wire from the main relay to a red tube 12mm diameter
75mm long (unless someone replaced it before).  they can corrode, melt or
the fuse can just blow.

Ground to the main relay is through the inj. box and a transistor switch
which is prone to burn out.  The fix would appear to be a brain
transplant but the relay doesn't need to ground through the brain, it is
fed control power from the ign. switch so you can cut the thin black wire
from the relay crimp a eyelet onto it and ground it to the body as in #2
above.

Lots of other possibility also but these are common enough that ARDNA 
addressed them in print but it is very difficult to find old bulletins.

Chris hall
AKA Beth's mechanic/husband
christian147@domain.elided

------------------------------