So it blows the 1 amp fuse how to i do I fix it or upgrade the wire

 

Did the radio come with a data sheet? If so, what does it specify as fuses go?

Does the radio have its own internal fuse? Many do.

Cheers
DD

 

The radio has it own ten amp fuse but it blew the factory 1 amp constant radio fuse from the factory

 

I recall my XJs having a 2 or 3 amp fuse. I'd try a 3 or 5 amp fuse and see what happens. At that level you're still safe as far as wiring goes. I can't remember the gauge of the factory radio wiring...18 gauge, I think?....

https://www.tessco.com/yts/industry/...get_wired.html

The "constant" radio circuit typically doesn't support anything except memory and clock. I can't imagine anything more than 3-5 amps being drawn....but I'm no radio expert. Newer models have all sorts of gadgetry.

Cheers
DD

 

The big question is where is the audio amplifier? The amp is what draws a lot of current . Most radio setups have two power wires: a very low current for the clock and memory presets that is hot all the time and another power feed that is switched thru the ignition switch , that one is usually 10 or 15 amps. So when you are driving and rocking out, get to your destination and turn off the car the stereo turns off. But the clock keeps ticking on. Look for another power wire on the back of the radio unit.

 

I'm not much on electrickery or radio. I've installed many an after market radio in other critters , but, it's been a while.

As to the constant on, agree, usually for memory and time only. Not much of a draw. but, one amp isn't much either. OTH, as I recall, the test for an unwanted draw is to measure draw with all powered items off at the battery. .o45 is the expected!!! Not even half an amp. So, if it blows an amp fuse, something is wrong. Or just a mismatch of load to fuse.

As to the 15 amp draw. Wow, To me that is asking a lot of a finnicky jaguar ignition switch . Were it I, I would insert a relay in that circuit. since com9ng in to jaguar stuff, I've become enamored of relays!!!

Carl .

 

Just a thought...

As an old timer, all of the aftermarket radios I've fitted had, as discussed here, a low amp fuse directly to the battery, for memory and clock. A high amp fuse went to ignition and supplied the actual power, including the internal amplifier.

But a few years ago, I got hold of a "modern" aftermarket radio--I was testing it for a fellow from this list in fact. It had a high amp fuse to the battery...this supplied the memory/clock, plus the radio and its amplifier. A low current fuse to the ignition supplied an internal relay that allowed power to be supplied to the radio/amplifier from the battery only when ignition was on.

So the amperate of the fuses was basically reversed from the "old days." I've noticed that a lot of things seem to be reversed from the old days.

 

Or, as I seem to do, more and more, get things backwards???



Carl