This is a quick post that consist to adding an extra contact to a relay.
In my case I have a lot of relays that have only a normally connected contact (NC). These relays are delivered with automotive alarms and destinated to be used as engine cutoff.
In electronic the most type of relays that are used contain two contacts:
1- Normally closed (NC): marked on automotive relays with number "87a".
2 Normally Open (NO): marked with number "87"
Most of relays manufacturers keep the place for both contacts in the plastic case but they put contacts depending from applications.
So the operation consist first to open the relay i.e to remove the plastic casing:
To have a double contact relay we have to use two simple contact realys. From one relay we have to dismantle the fixed contact and cut it to two parts: one part is used as contact (1) and the other part used as relay terminal (2).
All operations done we have to join the two parts to have electrical connectivity this can be done by simply soldering the two parts.
