I was getting frustrated today. I had convinced myself that my VRM install had gone wrong somehow.
Mr Cohrs suggested that I try this test procedure. A 9 volt battery. Alligator clip jumper from the battery negative to a ground lug, and get your negative multimeter probe stuck in this same alligator clip. Then put another jumper from battery positive to the B+ in on the VRM.
Put your positive multimeter probe on the VRM's B+ out tab.
Twist the dial on your VRM.
I got about 5.9 volts with the VRM twisted up to max, and down to zero turning the VRM the other way.
One caution: it doesn't start responding normally right away. I think something in the mosfet must need to build up a charge because initially, there's no response at all. Then for a while the voltage change is delayed - you turn up the VRM, and the voltage readout on your multimeter just
ssllooowwwllyy starts to increase. After a few times through, it responds immediately.
Thanks Mr Cohrs for this cool test procedure.
I had driven myself crazy imagining there was a problem, then I couldn't figure out my imaginary problem
This quick test demonstrated that the problem was just in my head, not in the VRM.
![Image](https://lh3.googleusercontent.com/2zW5lJtpMSBIkoEpv5KrQR1pFDxBZb8OQpGglq_zgI4GVc6EcBoaSCQjSpoQFO--JGLEqzcy91kC28Y6fnWtuX-md2gYHXFzuKE-6YrWTRSkENtt_cDdzcb7UTFHkkjdPpzE6O2LYsW2KNnXNP7w7Wymt7TtLdyOHwU656mfgQ_ZEnBCX7KmRxN8z81OnVJhko8w90KEzODfujb_Bnsz5di-cNZAaU4tRzWTmwXhxEPtlXj1Y3G_g6uRrXRLKoAkKWv9hxWJn535plyNTCbH9zNZlvMFeezCf-J2D1KWg3LE-jO1Vwa55GUmwmzyBczgeiLL5DwG__HvPmDnvppnUWmRgP0LR35HhwZvfJtkywEqfzkviJsdmv-Bm4ymtNESVlEHR6UWsZklcUq9JbjLx8lj5-Q873_HWkSyBnJrneLuuikLG3dAm3wYAa5cxGXQGVvnXLKku5FnqCUriTlqumcpqm1_NbMyc8tzyE4QTLzUU9GM2lI1fuUgpSSOsYclzTSLydURVSUaw0_wzABPqE_NPprzdxo13SKSVZ5nEpJ2HXJxtDEgvLnKtdiN3gFZ7a1Zz2mVsVB8D5f3qBA0nj__O7a9ISidOGgAvJr14hU2A2H9886uNTZ2Y-27DjmEuF8m7uOqAOSgbyngOUB6EvrwVzg7mx5xShgfNkC5PU5H=w739-h985-no)
![Image](https://lh3.googleusercontent.com/W7TWDY4uMX0_bGK1Ep5SlSNNN-0bNynzwsNmnmaIXjLYWobmrCKrekFSJkwpA4-HR1x3Y1U-agphee-e8hc4Otm6jJbfJMMlluOyS8k8JJq22OtiC8pCaVLyzXRxUQAoRaWzhnA7tbFxD6Yw27xZ99o6ZE7jP2LmNW26BJpRIgLSMpJ8xVu9FspxAYZjeVCbjXQz5y0xyHoquMPWPtOfAuvNuO7SL4T6gP7LWSUvkFU4fk30za-Mp7bMvXsWe3aUQ30ebFRFQCF9V7lKj0JFsxzd-ft6mYQF43jca60h3MBBd0QvP6SRwIGPcNk1kL3EiZAxZdHAer0aNXnJ6GKX3gNVNXhMBBuWFKl7u7YXWCboghSpXWhZv7sDhHAC7pnQbJOlbHVBkbOuou24VJd0Y_5IXaKdIEFm9R3zs-lXzfFwYNvSPpU7mQJ6f_IXp_spDV5kKpJB42OaMbzgBB2DyV5QwJoNbq1oVNgxgmxJArB-glTkLGHAyvgZgmfrAIo7Sek28rvNay7SZxV2fzSl3sxOk42D7_xFOZYspko9Ia6zNlwMuzdNhk1hKE8dpnA3kwKURHU2ipOqxmf9dvuhC-Pq2LerjwtuLgHBAqrBg3_a__Ocf8x5ziY4_GwcCZcHc5SiBiu9wvvMLuEmpZVXPk7HkT1hOAbnVlStWeQEKEr5=w739-h985-no)