Hi Bill,

I inspected the lines and solder joints again, but found nothing evident. I checked for continuity and everything appeared to be working. So, I decided to reflow the solder joints between S+ and A5, and then between S- and A3, including those of the resistor.

It is now working well, but only time will tell if I addressed the right issue.

Another thing I noticed is that previously there was a 7 km/h difference between the speedometer reading and the actual speed:

Foe example:
When the speedometer indicated 70, the GPS was showing 63 km/h.

After the reflow of today, the difference is now 5 km/h; 70 on the speedometer means 65 km/h.

I'm not sure which component is affecting the precision of the reading, especially after confirming that all the capacitors are good.

I would like to fix this and make it more precise, but I gave up a long time ago because I wouldn't know where to look.

Thank you for your help with this one too!

Alex