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As i was under hood today removing my smog pump and fixing the ground on the grill area.. I remember the relay i fixed for my fog lights the thing it plugs into is just gone.
Corroded to hell full of oil.. wires chewed up right at ends.. It works but id like a fresh clean one.
Do you guys know what im talking about if not ill post a pic.. Its the only relay on the fender by the smog pump.
Im not sure what i need to replace the entire thing
You can buy those any place that sells relays. You can even get them attached to new relays. Just make sure you get a relay with mounting Tab then you can install it correctly.
79 Cherokee WT QT Golden Eagle white with gold windows "Pigger" only blows hubs the night before a road trip or the clodest night of year. Has only been towed cause of stupid.
Question the relay on the Jeep is 4 pins, every bosch style im looking at is 5 pins. The 5th pin is the middle one which ours doesnt have.. will this matter ?
1998 Jeep Grand Cherokee 5.9L Limited 219k
1998 Jeep Grand Cherokee 4.0 I6 laredo 430k
1990 Jeep Grand Wagoneer 155k
1976 Jeep J10.. 85k(repaired)
will e wrote:The extra pin is a second power output. Handy for things like headlights when you want to power more than one thing from the same fuse.
Not exactly. I think you're referring to the NC (normally closed) output on the relay. These relays have two pins for the coil that energizes the relay, an input, and two outputs. One output is normally open (NO) and is closed when the coil is energized. The NC connection is goes open (disconnected) when the coil is energized.
There is soooo much information about these relays on the net... Just search for "Bosch relay diagram" and look at the many many articles and pictures. Easy.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
candymancan wrote:okay i dont know much about relays n stuff so i was just wondering.. Is this a 40/30 relay ?
30 or 40 amps is a typical rating. Did you read the existing relay to see what the rating is? If not, add up the wattage of the devices you are powering. 40A at 12V is 480 watts. If you need more, there are heavier relays at Del City.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
will e wrote:The extra pin is a second power output. Handy for things like headlights when you want to power more than one thing from the same fuse.
Not exactly. I think you're referring to the NC (normally closed) output on the relay. These relays have two pins for the coil that energizes the relay, an input, and two outputs. One output is normally open (NO) and is closed when the coil is energized. The NC connection is goes open (disconnected) when the coil is energized.
There is soooo much information about these relays on the net... Just search for "Bosch relay diagram" and look at the many many articles and pictures. Easy.
There are SPST relays that are both (NO). The schematic is such:
Not to be confused with SPDT which look the same but are as you described where output goes is 87A when not energized and only to 87 when enegerized:
Like you said, there are a bunch of different relays. I should have been more clear.
For headlights if you used the SPST and put one headlight onto 87 and the other on 87a they would come on at the same time.
If you replaced it with a SPDT the headlight connected to 87A would be on until you engerized and then the headlight on 87A would turn off and and the headlight on 87 would turn on.
I used a SPDT for my fridge in my jeep but wired it 'backwards'. The second battery is connected to 87A, so it powers the fridge (connected to 30)when the ignition isn't on. When I turn the ignition on it energizes the relay and power comes from the main charging circuit connected to 87. I have a separate solenoid that allows me to isolate the second battery with various options.