Using a relay to trigger another relay help question

[Lee Patterson]

I have an existing 20A Bosch micro relay that originally fed a set of low draw (7A) electric horns. I wish to continue to use that relay of which pin 86 grounds through the horn button on my steering wheel to power a second 30A conventional 5 pin relay to power an air compressor for a set of FIAMM Air Horns. The micro relay when connected to the second 30A relay work and I can hear that relay opening and closing. But when I put the compressor load on the 30A relay, it just blows the inline fuse I have. The compressor is being fed off Pin 87 of which Pin 30 is directly from my car battery with a 25A fuse in line. Logic says this works but it don't. The compressor when jumped across my battery works just fine and spins away and does not blow even a 30A fuse. I even went so far as to ground the compressor directly to the battery as well.

Is there something I am missing about using a relay to power a second relay that makes this not work?

thanks

 

[Bill Kearley]

# 30 Bat. power, # 87 load --- 85 is normally the ground to operate the relay and 86 is the trigger.
The relay ground and trigger could be reversed. Check your wiring !!!
Triggering a relay with another relay is fine but why ? Unless you don't want to dig into a harness to up grade wire size.

 

[Paul Hendrickx]

I have an existing 20A Bosch micro relay that originally fed a set of low draw (7A) electric horns. I wish to continue to use that relay of which pin 86 grounds through the horn button on my steering wheel to power a second 30A conventional 5 pin relay to power an air compressor for a set of FIAMM Air Horns. The micro relay when connected to the second 30A relay work and I can hear that relay opening and closing. But when I put the compressor load on the 30A relay, it just blows the inline fuse I have. The compressor is being fed off Pin 87 of which Pin 30 is directly from my car battery with a 25A fuse in line. Logic says this works but it don't. The compressor when jumped across my battery works just fine and spins away and does not blow even a 30A fuse. I even went so far as to ground the compressor directly to the battery as well.

Is there something I am missing about using a relay to power a second relay that makes this not work?

thanks

Hope this will help
greetings
Paul

 

[Paul Hendrickx]

Hope this will help
greetings
Paul

forgot one sorry

 

[Lee Patterson]

Thanks. Yes, I wish not to cut into my SPF loom just to power this air horn. I am feeding the new relay from the #87 output of the existing SPF horn relay which grounds on 85 through the horn button on the stalk. And I have 30 and 87 correct. Little bugger keeps blowing the inline fuse on new relay 30. I can hear the new relay closing and opening so I know I have it right there.