finding this ground

[gravismaximus]

my car has had a long on and off problum with this also besides the wipers. my car will just cut out and die. i have found the problum to be with the tach wire. that goes from the distribtor to the tach its self. i replaced the wire and the connector tabs. the problum went away for a while and seems to be coming back again for a 3rd time. ERRRRRRR. im looking in the 81 shop manual on page 8a-39 i see the wire i replaced, which has to be good, so maybe it has a bad ground. it dont say where this one grounds, the insterment cluster as a whole is a 3.0 black wire on the left hinge pillar. but this has a different ground wire connecting to the other? a 2.0 black wire with a splice in it # S225. where is this anyone know!!!! and where is C601? is that the plug that goes into the back of the printed curcit? i need some help so please go open up your shop manuals 81 guys.

just a thought--why does the tach even need to be working to get a spark? i dont have a computer any more and change out the distribtor. could i just ground the tach wire right to the engine (ground)?

 

[mike weyman]

i don't know if this will be of any assistance to you or not , but i had an 82 delta 98 with the same problem(losing power). the loss was a wire going thru the side of the distributor that had eroded inside , if you touched around it ,it would work for awhile then would quit again more often until the bad wire showed itself. the quick cure was to shove a sewing needle piece in between the two ends (this cure lasted for over a year).

just something to look at while you're there wondering ,mike
the delta never had a tach

 

[gravismaximus]

its a new distributor in it now, and it did it with the old distributor also. so i dont think its a wire inside like the pick up coil wires. thanks for the idea thou.

 

[gravismaximus]

went out tonight and took apart the consle--tach speedo and found that splice connection 225. holy moly, thats a lotta wires in one splice there 8-9. then the bigger 3.0 wire goes to the left hinge pilliar. so if that connection was bad id have a lot more problums i think, 7 or 8 more id say, lol. i mgonna soder the splice just to make sure and re tape the wiring harness. man there sure are a lot of wires back there for a 81.

ok if you guys would go to page 8a-39 in the shop book, accrding to the fig. the tach gets power from the pink/black wire. that also powers the brake warning light. i now that works ok the bkare comes on when i put on parking brake. it gets a signal form the distributor wire, which i have replaced already. and it grounds out using the 225 splice conection which i saw tonight thats good. so its gotta be the tach its self or the printed circuit thats messing up right?

i still dont get why it even needs a tach to run the car--any please explain.