Relay identification
The red stripe was used on metal housing Bosch relays to differentiate between normal relays and switching (red stripe) relays.
It's more important to look at the pin-out diagram on the relay housing to see what it does:
This is a SPDT (single pole, double throw) or switching relay. The output power changes from the "87a" tab to the "87" tab when energized by a signal.
This is a SPST (single pole, single throw) or normal (normally open) relay. The output power only goes to the "87" tab, or both "87" tabs, when energized by a signal.
This is the 192D relay available from NAPA that is similar to the second one above.
Some SPST relays sold for this purpose have only one "87" tab.
For the wiper relay modification, un-striped or "normal" SPST relays should be used. SPDT or switching relays are used for the headlight motors and A/C controls among others. In some cases, SPDT relays can be used in the place of the SPST relay, but you have to be sure of the pin-out requirement of the relay socket or application.
The SPST relays that have two "87" outputs are handy for lighting upgrades, since both "87" tabs are powered when the relay is energized.
Please note my
comment to the wiper relay diagram as created by Les; the "30" terminal is nearly always used for power input. "30" is the label given to the power input on wiring digrams like batteries and starters for instance. Following the standards for wiring helps avoid confusion in the future.
Hope this helps!:nod: