One thing you might find though is that your wipers run when you transmit. I found this on my 300 with my CB plugged into the cig lighter. Too weird.

Test the GPs with a ohm meter. I belive they should run around .06 ohms but i have had them at .05 also and worked fine.

The relay could be it but there is a troubleshooting section on the relay on the CD for this car. You might try going that route or checking a wrecker as they are kind of spendy I think.

You can find the reapir manuals on CD on ebay a lot of the time.

__________________
'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique