Troubleshoot Xfr Case Control Module? Buy Used?

[bluemoon]

I have a 2003 Ranger XLT FX4, 4.0, automatic. The 4X4 no longer engages, no clicks, nothing. I've read your troubleshooting guide and as many posts as I can find. I'm pretty sure my problem is the control module.

Questions:
1. Is there an actual way to troubleshoot my present module with a voltmeter to know for sure that it is defective?
2. I see these cost in the range of $175+ now to buy new. Is it advisable to buy a rebuilt or used one on eBay? It would be a lot cheaper, but I'm not sure of what the quality or dependability of those modules would be?

Thank you for your help.

 

[Curious Hound]

The troubleshooting guide in the " how to tech" section is pretty thorough. I'm not sure how else you would check the module. Are you real sure the shift motor is good? The contacts/wipers in the motor assembly are a very common issue. They get dirty and don't make good contact. I recently disassembled mine, cleaned it real good and lubricated the worm gear assembly before putting it all back together.

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