After 6 months of procrastinating I finally sorted out the issue.

I tried to do a circuit test myself but I was not able to measure that current flow to the right wiper motor. The left seemed to draw about 3A but the right just kept blowing the fuse so I didn't spend more time trying. I did replace the older washer pump as it had run dry previously and was concerned that it may have overloaded the circuit (thanks to this forum to consider this).

I took both wiper motors to an automotive electrical shop where , I'm sure, they had better equipment for testing. In a few minutes the tech tested both and reported that both worked but the right motor was not running well and pulled a higher current.

With that info I returned the right motor to the supplier and was provided with another motor. This replacement was just installed and everything appears to be working well. The headlight wash pattern is quite messy and lots of spray goes to the sides. Is this normal?

Anyhow, I'm happier that it is working. This was a baffling problem but I hope that the problem is now solved. Another lesson for me.

Thanks for the help and interest.

Cheers,
Paul

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1989 300E
1999 C230 Kompressor
2005 Toyota Highlander AWD

Also owned:
1964 Chevrolet Impala (first car)
1972 Fiat 124 Sport Spider (first sports car)
1976 VW Scirocco (first new car)
1970 Pontiac Parisienne (epitome of bland)
1980 VW Scirocco (last new car)
1953 GMC 6x6 (amazingly well engineered)
1967 Austin Healey 3000
1987 F150 4x4
1978 F150
1987 VW Jetta
1992 Toyota Previa AWD
2003 Toyota Sienna
2001 Nissan Pathfinder 4WD
1949 John Deere Model M