1997 p38 - fuse 12, 13, 14, 15 failure - Land Rover Forums : Land Rover and Range Rover Forum
 
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post #1 of 13 (permalink) Old 01-05-2019, 04:27 PM Thread Starter
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Exclamation 1997 p38 - fuse 12, 13, 14, 15 failure

Looking for help on this topic.
Checked main fuse 4 14.4 volts on both sides.... main fusebox checks out.
fuse box under passenger seat fuses show no power.
I'm assuming it's the becm failure...

So, where in the states can I get it repaired reasonably or what can be done

Location Long Island NY
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post #2 of 13 (permalink) Old 01-06-2019, 03:45 AM
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BECM failure should not cause lack of power on the fuses, you say you checked MF4, what about MF1 and MF5 ?, seems rather an interruption between the engine bay fusebox and cabin, see if you get voltage on wires C105(brown/green), C107(brown/pink) and C165(brown)


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post #3 of 13 (permalink) Old 01-06-2019, 07:11 AM Thread Starter
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Engine bay fuse box shows good voltage accross both sides of all fuses.
I was going to unbolt and see if I had it on the back side.

Regarding the passenger seat fb the brown wire is zero while the others are showing good voltage. Im assuming brown runs 12, 13,'14 & 15.

Have been trying to find a color code wiring diagram to trace the origin of the brown wire.

Thoughts?
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post #4 of 13 (permalink) Old 01-07-2019, 12:06 AM
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The brown wire(N) to C165 which feeds F12, 13, 14, 15 comes from C170 which is on the back of the engne bay fusebox and fed through MF4, it might be a bad contact there or within the fusebox, meauring voltage on both sides of fuses is not the best way to rule out things cos in some cases can be backfeed on the fuse's output, the only certain way to rule out a fuse is to remove it and check it's continuity, see if you get voltage on C170

for diagrams and connector views download this https://www.sugarsync.com/pf/D8700125_05791262_23123 , the colour codes are in the introduction page 11
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post #5 of 13 (permalink) Old 01-07-2019, 02:01 PM Thread Starter
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so I took it all apart today.
Checked all fuses with continuity no issues
disconnected the battery and flipped engine fuse box up to see the bottom.
checked continuity from the fb side of brown wire to the passenger fusebox and 100 percent continuity
took the blue M4 plug out of the bottom of the engine fb and noticed that the white purple wire on right side of plug was tinged light brown in plug area. emery cloth the prongs and put it all back together.

this is where it got sticky... repowered positive terminal and checked brown wire at the passenger fb. i had bright light on continuity tester and codes were gone on dash.
closed the engine box and hood and had no power again.

reopened everything and retraced all steps.

this time i chekced voltages on the bottom side of engine fb and noticed that on C 169, 170 and 171 i had three different voltages... 14.4 3.5 1.3 and the same at passenger fb on same wires.

i rechecked C165 and now there is a repetetive clicking noise in this fb. as well the contiuity light is dim and the blower is blowing when i take the key out of the ignition.

Hows that for gremlin.

917-709-3045
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post #6 of 13 (permalink) Old 01-07-2019, 02:08 PM
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You should rule out that fusebox cos it might have corrosion within

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post #7 of 13 (permalink) Old 01-07-2019, 02:14 PM Thread Starter
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plan of attack on that? saw some small philiips screws and thought of taking it apart....

thoughts?
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post #8 of 13 (permalink) Old 01-07-2019, 02:24 PM
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Can't you find a guaranteed good one at a scrapyard? or see the video cos it seems that there can be cracked or dry joints in it

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if you think my english is peculiar it means you didnt hear my japanese

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post #9 of 13 (permalink) Old 01-07-2019, 02:50 PM Thread Starter
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yes mine doesnt look that bad at all...

i saw this video...

i was wondering on checking the relays as the volatge issue is concerning...

and the clicking and the blower motor with no key in ignition...lol
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post #10 of 13 (permalink) Old 01-07-2019, 03:44 PM
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There are no relays involved between MF4 and the interior fuses, i dunno what to say more, for me the fusebox or the wiring between it and the BECM is suspect

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if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #11 of 13 (permalink) Old 01-09-2019, 02:11 PM
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Did you find the culprit? ... i'm curious

My friends call me Fery

2000 Discovery Td5 ES manual

Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope


if you think my english is peculiar it means you didnt hear my japanese

ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.
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post #12 of 13 (permalink) Old 02-19-2019, 04:18 AM
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There is no wire -colour diagram for the p38 ...have you downloaded the Electronic Troubleshooting Manual for your year-model. ?
I have tried twice here tonight to post awrite-up of how to open, repair and upgrade the fuse box, but I got timed out both times..
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post #13 of 13 (permalink) Old 03-20-2019, 11:16 AM Thread Starter
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ultimately i took the fuse box out, cut it open re-soldered the many failures, put it back in and it ran great.
I then ran into an alternator issue that lingered for a while as i could not get the voltage output to get above 14V and under load it was barely putting out 12V.

Ended up running a dedicated ground and feed to the back of the alternator to frame and battery.
Again ran good but then crashed and burned as follows:

Cranks but wont start - 1997 p38 gems motor

I sorted quite a bit out since owning this vehicle. Did the fuse box fix and everything was going great. Had an alternator issue and sorted that one out.... now I have an issue of a no crank no start.

Checked power at starter 12.5 volt, bypassed relay and motor spins but when placing relay 19 (SM)back in place no crank again. IF I take relay 21 out and place back in

I get key crank but no start.

Could use some help on this one.

No CEL on dashboard ever and not sure what it is but never saw it gefore.

Thanks in advance

My key fob is dead, has been dead since I've owned it, cant get battery open to change.
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