Roof Relays

[flybobbie]

Looking at larger amp relays, but the terminals are much larger. 80amp are 10mm wide.

[RobbiZ4]

Be very careful, as i.e. China relays may have the same pin sizes and orders, but the internal wiring differs. That is not always well documented.


WARNING - THIS IS NOT A RECOMMENDATION - IT WILL DESTROY YOUR HYDRAULIC PUMP !!!
WARNING - THIS IS NOT A RECOMMENDATION - IT WILL DESTROY YOUR HYDRAULIC PUMP !!!
WARNING - THIS IS NOT A RECOMMENDATION - IT WILL DESTROY YOUR HYDRAULIC PUMP !!!

I bought the following some weeks ago with 100A contacts. These contacts are very solid, but the internal wiring was not documented and finally wrong.

_Bild1.jpg (88.6 KiB) Viewed 306 times

WARNING - THIS IS NOT A RECOMMENDATION - IT WILL DESTROY YOUR HYDRAULIC PUMP !!!
WARNING - THIS IS NOT A RECOMMENDATION - IT WILL DESTROY YOUR HYDRAULIC PUMP !!!
WARNING - THIS IS NOT A RECOMMENDATION - IT WILL DESTROY YOUR HYDRAULIC PUMP !!!



But, why to risk a new adventure with unknown relays?
A higher nominal amperage is no garantuee for an extended lifetime. You have to start a new experiment with a higher risk, that a contact might get welded earlier and your hydraulic pump will die. Just the opposite, what you currently expect.

[Kiwi_Mike]

I changed mine today. Easy job.

But what surprised me is the relays I removed were dated 0949 meaning despite the car having a full BMW service history they have never been changed.

Does this mean BMW don’t believe they ever need changing?

[RobbiZ4]

Does this mean BMW don’t believe they ever need changing?

There is absolutely no plan for any roof or hydraulic maintenance available.

[flybobbie]

Yes i noticed the salmon relay may have in but coil suppressor diode.
I never noticed when i took one apart.
Also many various pinouts on those different relays.

[DAG]

RobbiZ

[Smartbear]

RobbiZ

Rob