Originally Posted by barry12345

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Since bridging the solenoid activating terminal to the main starter feed works. You have isolated the issue to low voltage to the starter solenoid.

Measure what is reaching the solenoid terminal. With the key in the starter engaging position of course.

Various ways to find the source of the voltage drop. On that feed. Even a low voltage light bulb with two leads perhaps. Or just keep tracing the voltage back to the source for the high resistance point.

As stated many have resorted to using the ford solenoid as the situation persisted. Even after the starter was rebuilt. The though given to the wire size etc on perhaps many German cars was not the greatest. For that circuit.

For example the rebuilt starters may have a poor aftermarket new solenoid that just demands more to activate. This is not a complex car. I stay away from chain store items on the more modern complex cars for several reasons. The aftermarket parts are worse than just hit and miss. Far too many only work for a very short time as well. The chain stores unless something has changed look for the lowest price provider for what they sell. Some may have been burnt so bad they have stopped this practice. I just do not follow things all that well. Since I reduced activity.