Date registered: Feb 2008
Vehicle: 1991 500SL (Japan) - 133K KMS
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If my roll bar was up and the top was up, when I put the top down, at the end of the cycle the roll bar goes up. If the roll bar was down, and the top was up, when I take the top down, the roll bar does not go up. Seems to "save" the last position of the roll bar.
The picture darraghodonnell posted is what my roll bar looks like when it's up. So if yours looks anything like that, it's extending properly.
I'm totally guessing here, but since you've had some battery issues and all this, I wonder if a damaged OVP or a blown fuse on the OVP could play a role in this? Again, a total guess. Might be worth checking to see if the OVP's fuse(s) are okay. I say fuse(s) because the newer revisions come with two 10a fuse slots, albeit "half the pins" aren't connected anyway (on my 91 anyway). It's located in the relay compartment which is on the passenger side, against the firewall. Six screws fasten the cover down. You can't miss it. Almost in the middle with a single (or two) fuses on TOP of the relay. I'm sure if your OVP was buggered up you'd have some more issues, but you can't lose with an inspection right?
My Over Voltage Protection relay was damaged when my dad jump started another vehicle with mine. Wreaked havoc. ABS/ASR lights on, eventually jumpy idle issues.
1991 500SL (Japan)
Last edited by infra; 05-14-2010 at 01:14 PM.