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Discussion Starter #1 (Edited)
We've just gotten our 89 Mustang GT manual trans back from the paint shop and once the battery was charged, we tried starting it. We had power to the dash, lights, and fan. But no crank. We removed the starter and took it to O'Reilly and they tested it and it was good. We then replaced the solenoid. Now we have no lights, no fuel pump, no fan in the key on position. No power at the red/blue wire on the solenoid (in key on position).

We've done the following:
1. Replaced battery as it was charged but under load didn't provide enough amperage
2. Replaced ignition switch twice
3. Replaced solenoid twice
4. Pinned out red/blue starter switch wire and there are no breaks in wire (ohms out fine)
5. Fusible links checked out ok and they do not look bubbled, burned or warped
6. Verified ground between solenoid and fender
7. Verified body ground to the engine block
8. Verified main ground to the battery (in trunk area)
9. Found cream colored plastic box under left-side kick panel - we've not figured out what this is nor do we see it in the Ford dealer manual. The red/blue starter wire goes in this box. There is no red/blue wire coming out of the box.

Edited to Add:
The other thing we tried was to remove the starter cable from the solenoid and jumped from battery side of the solenoid to the other side of the solenoid, turned key on and we have full power, dash lights, fan motor and fuel pump.

Any help would be appreciated! We've been pulling out our hair for a week troubleshooting.
 

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Discussion Starter #2
Resolved!

We resolved the issue by the following two items:
1) Swapped the battery cable to the left post and the other cables to the right post of the solenoid.
2) Found the red/blue wires going into a connector under the dash and the previous car owner indicated he had to put a fuse in there.

We aren't sure what the connector goes go but we can now start the car with the key.

Here is a picture of the connector.
 

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that is a connector for the clutch safety switch

that is ghettto
 

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Discussion Starter #4
Yeah, we know the wiring is ugly. The previous owner had stripped most of the car to race it. Thanks for identifying it as the clutch safety switch.
 
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