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I just fixed a no spark problem by replacing the wire that goes from the tfi-iv module to the coil. It was the dark green/yellow. I did a lazy mans fix and just strung the new wire around the cabin instead of through the bundle of wires.
As a result the truck starts and runs but I lost my tach. I'm reading conflicting articles that the tach was either wired to the coil or to the computer. I believe mine is supposed to be wired to the computer. my haynes onky shows 1 green/yellow wire going to my coil from tfi. It also shows a wire going from yhe eca to inst cluster.
So why would cutting out that green/yellow wire lose the tach. Is there supposed to be another wire that splices into the tfi to coil wire for the tach to get signal from? I was figuring my tach got its signal from thr computer(eca).
Just took a look at your diagram & i see that DG/Y isnt spliced to anything. Go figure. Mine is an 87, my guess is yours should be wired the same as mine.
Right. Haynes and chilton show the same thing you said for the' 87. '88 and on it doesn't. What my diagram shows for the '88 is there's a green/yellow wire from pin 4 on the eca with a resistor to the instrument cluster instead of splicing to the to the coil/tfi wire.
However, my tach went out when I replaced the coil/tfi wire (dg/y) which would make sence with the '87 diagram.
I guess i'll have to see if i can find the wite coming from pin 4 on the eca and see where it goes
If the factory DG/Y is broken on the tfi side of the splice you might just need to connect the old and new wires together at the coil to put the splice back in the circuit. If yours is wired like my 87.
Well i'm trying to link to the diagram but it's not working.
It takes about a minute to sign up for an account at bbbind.com then click wiring diagrams
Enter the info for your truck
When it asks for system enter engine
sub system is starter.
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