Mitsubishi J53 electrical question - JeepForum.com
 
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post #1 of 7 Old 01-31-2021, 05:36 PM Thread Starter
mlew2433
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Unhappy Mitsubishi J53 electrical question

Hello fellow Mitsu Jeepers, I have a 1989 Mitsubishi Jeep J53 with the turbo diesel engine. Was running and driving great, until I decided to remove the gauges to clean em up. With the gauges off, Jeep lost all electrical power (won't crank, no power to lights, etc). Batteries check out ok, and the only fuse box I found has no fuses for ignition. I used a test light on the ignition switch cable and looks like it has power, and I can hear the ignition relay when switch pin is probe with the test light.
Is there some sort of "magic" power cutoff when you remove the cluster/gauges? Any other fuse box other than the one in the drivers foot-well?
Any info would be GREATLY appreciated.

Thanks!


Marcelo

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post #2 of 7 Old 01-31-2021, 09:39 PM
BagusJeep
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Does it have an ampmeter? Is this on the direct line between battery and solenoid? Did you remove it?

BagusJeep lives in Bali with far too many 4x4s:
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
1980 Land Rover Series III 109" troop carrier - ROVER
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post #3 of 7 Old 02-01-2021, 06:20 AM Thread Starter
mlew2433
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That was it BagusJeep, thank you!! I should have known this by the size of the wires. I should be ok wiring this together temporarily until I replace the gauges just to start it and move it around?
Gauges question: I am looking to replace the gauges with some aftermarket ones, I see they say 24v on the back but the wires for the fuel and temp gauges look more like a 12v. Do I need 24v gauges for these 2?


Thanks again!


Marcelo
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post #4 of 7 Old 02-01-2021, 09:32 PM
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Ampmeters are a little bit dangerous in that the entire power of the battery is taken to the dash. A lot of owners of old Jeeps swap them for a voltmeter and wire directly between battery and solenoid. but yes, you can fasten the wires together with an appropriate bolt, just make sure the ends are well covered up or it will spark and then burn (no fuse)

Is yours a 24V or 12V model J53? A lot of the diesels are 24V, and have two batteries under the hood.

However the fuel and temperature gauges are unlikely to be operating on 24V, there will be a Constant Voltage Regulator to drop the nominal 23-29V that the Jeep runs on, to a constant value, possibly 7V. This keeps those two gauges accurate under all engine speeds and loads. The CVR used to be external, with such a late one it may be internal as modern gauges for 24V applications should have built in CVR, worth checking though.

I suspect you will find that all genuine Mitsubishi gauges are pricey. (And yes, I found they were verrryyyy expensive when I looked)

BagusJeep lives in Bali with far too many 4x4s:
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
1980 Land Rover Series III 109" troop carrier - ROVER
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post #5 of 7 Old 02-01-2021, 10:23 PM Thread Starter
mlew2433
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Hi BagusJeep, yes is a 24v system. Looks like my gauges have the cvr outside (see pics). Shall I then get 24v gauges (which should have the cvr inside)? I am looking at VDO gauges as there are lots of options.
Question for the temp gauge: Is the sensor the one by the thermostat housing, or is there another one on the engine for the temp gauge? Can I splice the new temp gauge into the existing wires or need to run new sensor to engine?
Thanks again for your help!
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post #6 of 7 Old 02-04-2021, 11:28 PM
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If you want to replace a gauge you first of all need to find out the spec of the sensor. You can buy a sensor to match your temperature gauge for a few bucks. The other option is to get a mechanical temperature gauge, the sensor end may need an adapter to fit. Indeed you could get a mechanical oil pressure gauge as well.

Fuel gauges are more difficult, you could get accurate resistance measurements on the fuel sender and work out the likely scale.

Were they working when you took them out?

It has the instrument panel in front of the driver (not like a Willys) but the instruments are the same size. I had a Mitsubishi speedo in my CJ3A and a collection of odd gauges. $50 got a complete new set from India.

I would suggest before diving into it too far that you take the gauges apart, take whatever measurements you can with a multimeter for resistances and post up pics and readings for John Strenk on the CJ Forum. He is the guru of instruments and will be able to tell you exactly how they work and whether they can be simply repaired. Mitsubishi put some quality OEM gauges in, they look much better than the cheap Crown gauges most CJ owners put in.

BagusJeep lives in Bali with far too many 4x4s:
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
1980 Land Rover Series III 109" troop carrier - ROVER
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post #7 of 7 Old 02-05-2021, 10:28 AM Thread Starter
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Thank you for the recommendations!


Marcelo
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