jmunzke 1 #1 Posted October 6, 2011 I am looking to replace the harness on my 1990 520H. I am aware of the availability of a 1991 and a 1989 harness. Are these compatible with a 1990? Share this post Link to post Share on other sites
zieg72 209 #2 Posted October 6, 2011 does your 90 have the extra test switch on the dash? I know the older ones do and with the hydro not on the column the safety switch may be in a different spot, I don't know for sure. Share this post Link to post Share on other sites
JackC 616 #3 Posted October 6, 2011 Have you checked the parts diagams (partstree.com) for each model year to see if they are the same part number? If not they should be close and you may be able to tell from the diagram what the differences are. Share this post Link to post Share on other sites
546cowboy 301 #4 Posted October 7, 2011 My 1990 has the test switch on the panel to see if all the lights work if that's what you're talking about. I have changed harnesses between different years and the thing I know that's different is the oil pressure sender and connector. Share this post Link to post Share on other sites
