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10-01-2019
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Full Flexer
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Join Date: Mar 2016
Posts: 1,133 What Jeep do I drive?: XJ
Likes: 109
Liked 640 Times in 436 Posts
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so I just found out a bad thing if you own a pre-update
the heater/aircon fan circuit pulls full current thru the ignition switch, wiring, fan switch etc..NO relay/s
lots of ways for things to self-immolate, including the ignition switch
I found a corroded connector at the resistor block had fried the wiring & connector..now fixed..but the original design flaw persists (corrected on post-update, used relay and switched -ve)
There is one obvious solution, which I will probably implement
Make a 4 relay pack ($17.95 on Ebay), mount adjacent to fan, run wires thru firewall
one of my '96 has a aftermarket ignition system fitted, old one must have burned out, and taken some wiring with it,
__________________
'96 4.0 Sport 370k+
'96 Limited 263k (unreg spare)
'96 Sport 335k (got smashed, farmtruck)
Last edited by awg; 10-01-2019 at 06:39 PM.
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10-01-2019
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CrawlerStar
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Join Date: Jan 2012
Posts: 470 What Jeep do I drive?: XJ
Likes: 409
Liked 228 Times in 157 Posts
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When you put the relays in, show us how you went about it. It's likely not only me who didn't know about that wiring disaster waiting to happen. Bean counters strike again.
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11-01-2019
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Full Flexer
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Join Date: Mar 2016
Posts: 1,133 What Jeep do I drive?: XJ
Likes: 109
Liked 640 Times in 436 Posts
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here is the circuit diagram,
had to rethink my plan, relays need to intersect the wires to resistor pack, marked in red, to retain 4 speeds, therefore 4 relays in cabin, adjacent to resistor block.
Should be out of the way, if packaged well, needs 12V in cabin, probably run a fused wire thru the firewall.
all ideas welcome, especially before fitting
dont want to introduce new Automotive Electrical 101 mistakes
__________________
'96 4.0 Sport 370k+
'96 Limited 263k (unreg spare)
'96 Sport 335k (got smashed, farmtruck)
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11-01-2019
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Rock Munki
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Join Date: Mar 2008
Location: Kellyville NSW
Posts: 2,381 What Jeep do I drive?: XJ
Likes: 178
Liked 351 Times in 223 Posts
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i must be missing somthing.
i would be using 1 relay to supply power to the blower switch.
Bypasses the ignition switch to supply the blower switch @C236.
if it shits itself so what its not a show stopper, put a smaller fuse in if yr that worried.
usually, the resistor packs shit themselves not so much the blower switch.
good luck with it.
__________________
Obd1 scanner.
'95 sport,4.6 stroker, 4.5" lift, 32"s, 4:10's, 8.25&SYE, taurus fan
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12-01-2019
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Full Flexer
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Join Date: Mar 2016
Posts: 1,133 What Jeep do I drive?: XJ
Likes: 109
Liked 640 Times in 436 Posts
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Quote:
Originally Posted by rainman
i must be missing somthing.
i would be using 1 relay to supply power to the blower switch.
Bypasses the ignition switch to supply the blower switch @C236.
if it shits itself so what its not a show stopper, put a smaller fuse in if yr that worried.
usually, the resistor packs shit themselves not so much the blower switch.
good luck with it.
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I think your idea has great merit, and might just do that, as the ignition switch IS the name of the game, I can always swap a blower switch out
I had a close look at a couple of resistor packs, I am suspicious that people find them dead, but they are still ok.
there is a $3 thermo fuse in them, and wire coils for resistance
__________________
'96 4.0 Sport 370k+
'96 Limited 263k (unreg spare)
'96 Sport 335k (got smashed, farmtruck)
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09-03-2019
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Full Flexer
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Join Date: Mar 2016
Posts: 1,133 What Jeep do I drive?: XJ
Likes: 109
Liked 640 Times in 436 Posts
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2" suspension lift, shocks, adjustable trackbar etc swapped over from my smashed black one to my new white one, you get to do the job twice when its a swap..fkn yay
new swaybar links & bushes
we drove them both up to my rural block and the black one is now up there for good, unreg, still goes well
while I was doing my swaybars, I noticed that there was no fluid of any sort leaking on the underside, after my extensive leak repair & cleaning
I was also thinking a swaybar disconnect would be a complete waste of money for me, as I very rarely venture where it would be required, and I found that if you carry tools, impact wrench & blanket, (all of which I do when off-roading), you can drop or install the entire thing in 5minutes, without raising the vehicle or removing any other item
__________________
'96 4.0 Sport 370k+
'96 Limited 263k (unreg spare)
'96 Sport 335k (got smashed, farmtruck)
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20-03-2019
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MonsterMoose
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Join Date: Nov 2003
Location: Brisbane, Southside
Age: 52
Posts: 10,545 What Jeep do I drive?: WK2
Likes: 369
Liked 1,113 Times in 693 Posts
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You could use relays for the blower fan if you wish, you'll need a way to vary the power to the fan motor but this can be achieved quite easily and cheaply with some simple dc-dc buck converters, one for each speed except high....
__________________
JJ
Do it once, Do it right!
2014 WK2 Overland
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