FASS relay burnt out, cannot find replacement
- Thread starter Dm23
- Start date
Looks like a standard automotive relay. Napa, AutoZone, etc should have them. Maybe not with the mounting tab but everything else should be the same
Standard 5 pin probably. Grote #84-1076
Yep, 40 amp standard relay.
On circuits that kept melting those, I swapped to Napa ST85 4 post solenoid relay, rated at 100% duty cycle at 80A
Something is wrong if it’s melting the relay though. On a lift pump Id look at the connections and wire quality/size for the run.
I would think if the relay keeps burning out, then the motor may be going bad, pulling more current similar to a starter motor going bad. Just my .02.
Also, moved these posts to their own thread in Fuel System section.
Also, moved these posts to their own thread in Fuel System section.
I think there was moisture in between the relay and harness. I think I solved the issue ??. Found a replacement relay and pump seems to be working fine now. Thank you for the advice. Hopefully it was just the moisture.
Just to give some context. I shut the truck off and the fass kept running, pulled the relay off and it stopped. Put the relay back in while the truck was off and the pump kicked on again. I was able to find a new relay and it seemed to fix the issue for now.
Just to give some context. I shut the truck off and the fass kept running, pulled the relay off and it stopped. Put the relay back in while the truck was off and the pump kicked on again. I was able to find a new relay and it seemed to fix the issue for now.
When my airdog relay went out the truck would not shutoff, even with batteries disconnected. The airdog jumps off the ignition fuse, and is took 4 years for the relay the go bad, so I can't complain.
I've had 20A motors with 10ga and 8ga wire fused at 25A, melt "30A and 40A" 100% relays. Mainly it would melt the insulation inside the solenoid of the relay.
And not just a one time thing had a bag of 6-8 of them at one time
Inductive loads like motors are hard on relays. That's why you'll sometimes see dual current ratings on them. The lower number is for inductive loads like coils, solenoids, motors, etc. the higher current number is for resistive loads like light bulbs.
You can put a diode across the contacts to help reduce the arc that occurs when the contacts open. It might double the life of the relay. But the best way is to oversize the relay several times over the current rating of the motor. IE: 50A relay for a 10A motor
You can put a diode across the contacts to help reduce the arc that occurs when the contacts open. It might double the life of the relay. But the best way is to oversize the relay several times over the current rating of the motor. IE: 50A relay for a 10A motor
I always understand to the dual rating was one was for NC and other was for NO default setting.. usually found on 5 pin relays
That is true for that ones shown above. The duel rating if followed by a "Res" means resistive load. Probably didn't explain that well enough as it could easily be confused with the different ratings of the NO & NC
This information is from "FASS"
"Bosch 0332209150" this gets you the mountable relay.
I just picked one up from NAPA this morning $25.73 out the door.
"Bosch 0332209150" this gets you the mountable relay.
I just picked one up from NAPA this morning $25.73 out the door.
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Wtf. I hope it came with a pigtail for that price
No it did not, it was more cost effective than the NAPA ST85 4-post relay @ $68.
Here are some pictures of my Fass relay.
Sent from my SM-S928U using Tapatalk
Sent from my SM-S928U using Tapatalk
Interesting. A Hella headlight relay.
Pretty common actually.
End of the day I haven’t found any difference between any of the same amp rated relays. They all turn green eventually lol. Only difference is if you want a mounting tab or not.