Robin 993DX

I am in the process of helping a friend trying to fix a battery drain issue with his 92 964 Tip. The dealer said that the battery drain is caused by a bad CCU, which was difficult for me to believe.

Normally the battery would drain enough where there isn't enough amp to crank the starter in about 3 days, after I removed the CCU the car starts strong even after 5 days.

Also the HVAC system has an intermitten issue, sometime it works sometime it doesn't.

Have anyone heard of a bad CCU causing battery drain?

I opened the CCU and didn't notice any cold solder joints or burnt component.

TIA

DarrylH

This is a not uncommon problem. It's usually a defective transistor or a running on sampler fan.

Systems Consulting fixes these units. Loren from there posts here occasionally.

I found these with "CCU" and "transistor".
https://rennlist.com/forums/search.php?searchid=1759592