Hey Del
That is not a resistor, that's a spike diode, to protect whatever is driving the relay, AKA EFI module. You MUST be sure you get that polarity right. Many relays have them built in, and the "internet wisdom" claims that SOME are backwards. Isn't that a bummer. The band is the cathode, and current goes from neg to positive from right to left. You do NOT want current flowing in the diode, so you must power the relay with the positive feed on the BAND end of the diode, IE the red wire pos. in your photo
(DO NOT connect polarity as shown here, these polarity markings cause the diode to conduct. You want it "turned off."
Another thing to look for is that some relays are a "trick." There are two versions I've seen and don't know what they are called. On one version, a quick glance would make you think that the relay is a double throw, AKA has one normally closed (NC) contact. But these special versions have TWO of the blades in parallel for extra current, and in fact are ONLY normally open (NO). The second version I've seen, the blades are quite large and require a different socket. Some of these are rated up into 40-50A
All these such "Bosch" style relays are continuous duty so far as I know.
This website:
https://www.12voltplanet.co.uk/relay-guide.html
Pictures the difference between a SPDT and one with bridged blades for more current, SPST only. They are calling the SPDT a "changeover" and the SPST a "doubled output
That is not a resistor, that's a spike diode, to protect whatever is driving the relay, AKA EFI module. You MUST be sure you get that polarity right. Many relays have them built in, and the "internet wisdom" claims that SOME are backwards. Isn't that a bummer. The band is the cathode, and current goes from neg to positive from right to left. You do NOT want current flowing in the diode, so you must power the relay with the positive feed on the BAND end of the diode, IE the red wire pos. in your photo
(DO NOT connect polarity as shown here, these polarity markings cause the diode to conduct. You want it "turned off."
Another thing to look for is that some relays are a "trick." There are two versions I've seen and don't know what they are called. On one version, a quick glance would make you think that the relay is a double throw, AKA has one normally closed (NC) contact. But these special versions have TWO of the blades in parallel for extra current, and in fact are ONLY normally open (NO). The second version I've seen, the blades are quite large and require a different socket. Some of these are rated up into 40-50A
All these such "Bosch" style relays are continuous duty so far as I know.
This website:
https://www.12voltplanet.co.uk/relay-guide.html
Pictures the difference between a SPDT and one with bridged blades for more current, SPST only. They are calling the SPDT a "changeover" and the SPST a "doubled output