Anyone have info on year/model Chrysler relay that works on the 5.3 and a wiring diagram. I remember someone on here providing pictures etc but a search netted nothing. Tired of un-capping/cleaning and the high price of the crude original...same unit used on numerous Brit cars yet still to $$$ for what it is and it's questionable longevity especially under the heat exposed to by the V-12 engine compartment.

 

I think the part number is in Kirby's book, isn't it?


The lower price is attractive as the originals are stupid expensive. As for longevity, though, the originals usually last 15-20 years. That ain't bad :-)

Cheers
DD

 

Google BWD S109 relay. I think that's the one


BWD S109 - Relay - Multi-Use | O'Reilly Auto Parts


Cheers
DD

 

Doug, you're right about the time frame BUT mine in the XJS is 27 years old, the one on the shelf is as old and the one in the TR-6 is 39 years old....out with the old, in with the new AND cheaper AND more reliable (that's if I make it 30 more years!)I've un capped and cleaned the old ones I've got enough.

 

Now I did just stumble on this which is just useing a simple auto relay...hhmmm, not the "Chrysler mod" interesting, I've got a couple of these hanging on the wall in the garage. Funny thing is they are showing 4 wires and I'm pretty sure there is more then four! I'll have to look.

Jaguar Specialties

 

Sounds good. I'd be tempted to get a 40amp version just to be safe

Yes, you almost certainly have more than four wires but some of those are either piggy-backed externally or are attached to terminals that are externally separate but joined together inside the relay.

Cheers
DD

 

reviving old thread.
has anyone used the BWD relay successfully?


also, is it more likely for the starter relay to fail or the solenoid on the starter motor to fail?

symptoms:
when starting the car yesterday, i turned the key to start, got some weird, loud, shrieking, electrical feedback through the car speakers. quickly released. then when i tried to turn it again to start, it started right up.
this happened 2x yesterday.
drove car around, with no obvious issues.
3rd time, similar shriek, was only moving the car down the block, but it was not holding charge. voltmeter in the dash was down toward the "low" red level.
4th time, car would not turn over. seemed like dead battery.

tried to jump with another car.
battery seemed ok during powering up. (cables not hot)
tried to start with other car still hooked up. not enough electrons to get it started.

decided to go back and reattach cables for stronger hold.
removed all cables.
when i put the cables back, the car started cranking on its own. no key in the ignition. like christine, our friend the red plymouth fury.

took off the cables. cables were hot at this point. went to the front of the car. could not isolate anything, but there was a distinct electrical burning smell.

soooooo... back to my original question. does this sound like a failed starter relay? or failed solenoid on the starter motor?
(here's hoping its the former)

thanks!

 

More visitor opines:


1. a poor ground can be detected by a hot cable.


2. A NOS electric part is good even if old. it's use that wears them. Contrary to the "use it or lose it" adage.


3. I used the Chrysler solid state relay salvaged from an old cop car that saw it's lasrt days as a jalopy racer. Solved a heat crank issue in my IHC Scout II ! Delco starter is similar architecture.


4. I robbed a Hella realy from a driving light kit for my Jaguar's starter relay.


Most relays. 1. ground. 2. power source. 3. trigger source. 4. load. The start circuit uses a switch to interrupt the ground unless the shifter is in P or N.


5. I have a small relay with a melted side. The miniature electro mechanical guts are fascinating.


Carl