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Hi,
I’m not so familiar with the ECU terminals, but Art is.
One contact set, in the relay, powers only the main fuel pump circuit of both pumps!
The rest you mention is on the other contacts but you say you have power on them.
This means the ECU needs to see a signal from the ICU out there under the hood.
They can be terminal issues if some unplugs the ICU.
Chrysler did a dumb thing using one time use pins.
I have found a bad yellow wire on my 1986, by chance, long before I learned more!
Because you have a spark that means the Hall effect sensor in the distributor is sending the signal to the ICU.
The ECU maybe waiting for its signal but if you have power on the AMM orange wire the relay is closing. This is a confusing dilemma, in progress, due to all of us not knowing one particular detail, I’ll bet!
Make sure you have cleaned all the fuses tips and holders in the hinge fuse panel!
There are at least two fuses involved with starting, but we might be all past that!
Check the terminals of socket on the relay. You can get voltages but there maybe a current or amperage transfer problem.
Listen to hear IF the pump has been running AFTER you stop cranking! That proves the other side of the relay is working as well and the pump. Listen quickly, as it’s short to run long.
The 1988 was the last year of the ICU out there under the hood.
Later cars turned over to the CPS and EKZ or EZK system and its ECU runs the fuel pump for a second before cranking over.
Tell us the last three digits of ECU number and label color to see if it’s one that gets prone to start issues. I always want to blame it last but they are aging.
Others may know, if it does or does not.
Phil
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