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    Re: Previa Dashboard Lights Bulbs

    Another trip to the Yahoo! Previa archives to dust off this photo essay by "bat00k" and some comments by Eric Collins.

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    Re: lights/power/voltage drops

    Re: Voodoo and wiring currents

    Once your wiring capacity is big enough to carry all the current being drawn by the loads, the only thing that varies with extra wires connecting the same two...
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    Re: lights/power/voltage drops

    That break in the ground strap insulation doesn't look serious at all. And when you put the jumper cable in parallel with the ground cable you eliminated it as an electrical path that might be the...
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    Re: lights/power/voltage drops

    Prev,

    I may have misread something you said in your very first post, that "I ran a new battery cable from the battery to ground, no change." Did that mean (I assumed) you actually replaced the...
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    Re: lights/power/voltage drops

    Well, hopefully your alternator is really not, as they say, boro-boro (nearly worn out).

    As agitating as it is, it'd probably be a good idea to take a deep breath at some point and start ...
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    Re: lights/power/voltage drops

    Well, unfortunately your multimeter can't do what you're asking of it. A lot of lower-cost multimeters aren't capable of just measuring the "ripple" (alternating) voltage that goes slightly up and...
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    Re: lights/power/voltage drops

    I've looked over the thread and am not sure you measured "AC" voltage across the battery terminals with the van running (i.e. the alternator running). AC shouldn't be more than say, 0.2 volts -...
  8. Re: Yahoo Previa Group Files available until 12/14/2019

    If you know where else I should put the download where it's only available to members (like the "wanted" posts) let me know. I don't want a link to my personal OneDrive on here where anyone could see...
  9. Yahoo Previa Group Files now available in easily readable form

    The original Yahoo Previa Group files I archived were in ".json" format which made them laborious to read. I since ran across a program that could extract all the posts to readable, dated .eml files...
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    Re: lights/power/voltage drops

    Looking back at your pics I see the difference between your fuse box and mine, primarily that your battery connection doesn't have an integral metal piece sticking out to the battery plus terminal...
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    Re: lights/power/voltage drops

    Yes, the voltage "drop" or "loss" is the reduction in voltage across a good metal conductor, which should be tiny. You should only see large differences in voltage across things that are either...
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    Re: lights/power/voltage drops

    Yes, the alternator supplies voltage to the battery - higher than the battery's voltage on its own - in order to charge it. (The battery also "smooths out" variations in the voltage from the...
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    Re: lights/power/voltage drops

    Hah! I've still got my radio pen! It's in the garage in the misc-stuff-in-drawers section.

    Anyway, if it were easy to do, you could leave your black lead on ground and measure the voltage from...
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    Re: lights/power/voltage drops

    Don't use anything that doesn't draw a steady current, like those flashers and wipers - they will make things jumpy and unreadable as you saw. The lights brakes and high blower is fine.
    So with...
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    Re: lights/power/voltage drops

    So that's not the problem I guess.
    When you were measuring, were the lights and brakes on? You want a decent amount of current flowing while you measure the voltage because of the possibility that...
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    Re: lights/power/voltage drops

    I got curious and disassembled my donor's fusible link box, as in totally extracted all the metal brackets and connectors. I'm putting together an exploded-view diagram, but now that I understand its...
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    Re: lights/power/voltage drops

    Looks like you are getting a solid voltage from the battery & alternator. No need for a fast-idle IMO, that was more if the voltage at idle was marginal. i.e. close to 12v and not 14-ish where is...
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    Re: lights/power/voltage drops

    I'm going to disagree about soldered wires being better than crimped in the sense that either can be bad if not done properly. You'll find crimped connections all over mission-critical things that...
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    Re: lights/power/voltage drops

    To see what's happening, don't measure resistance (ohms), measure DC volts. Measuring ohms on anything other than an unpowered wire to ground or across a single unconnected component won't be ...
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    Re: lights/power/voltage drops

    Also, since you're kind of being drawn into the mysteries of electrical theory despite your reticence, consider one of these:
    "Southwire 16030A Autoselecting CAT IV Multimeter"
    I bought one for...
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    Re: lights/power/voltage drops

    OK, with the brake circuit still disconnected from power, does anything else that draws power dim the lights, like the fan on high (turn up the one in the middle AC part too) + interior lights +...
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    Re: lights/power/voltage drops

    If it was me, I'd want to make absolutely sure the alternator is good, especially since your original post said pretty much any significant load on the electrical system was causing the lights to...
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    Re: lights/power/voltage drops

    Something easy to try - the power for the headlights runs from a fusible link, through a Head Light Relay, through (right & left headlight) fuses, to the headlights, then to ground through the combo...
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    Re: lights/power/voltage drops

    Added resistance from anything along the path from battery + through loads then to chassis ground is a problem. Anything that has a higher resistance than normal can assume a larger share of the...
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    Re: lights/power/voltage drops

    No idea then. I don't what they test at the parts stores - if it's just voltage at the battery, that's not great. The gold standard is some kind of load test where a drain is deliberately placed on...
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    Re: lights/power/voltage drops

    I would think the next suspect is the alternator itself. Go somewhere (Autozone, etc.) where they can hook up a charging circuit analyzer. The battery isn't particularly good at dealing with any...
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    Re: Previa 1994 handbrake cable

    I hope it's not too cold to take some photographs of your work to post on this thread! Then you will be thanked in the future.
    Työ tekijäänsä neuvoo if I have that correct (in medical training,...
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    Re: oil sensor wiring

    Sorry, missed your edit. I suppose a Previa owner tends to be the determined type...
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    Re: oil sensor wiring

    My vote is to give yourself a break until it's a more comfortable situation to deal with (how do you even know the donor sensor isn't going to give you trouble?). Tie up the wiring somehow, put some...
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    Re: oil sensor wiring

    That sensor type seems to be used on many other Toyotas but not the Previa. To see it in action, you can go to this (leisurely-paced) YouTube video 5 minutes in.
    ...
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    Re: oil sensor wiring

    For securing the wire coming out of the connector, on mine there's a bracket screwed to the lower-left, um - ear? - of the sensor. That bracket in turn has a protruding tab, onto which is snapped...
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    Re: oil sensor wiring

    I can tell you how the sensor works on my '92 but don't know if that's the same as your engine+engine computer+harness combo.

    The oil level sensor is a magnetized "donut" that floats up and down...
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    Re: Previa 1994 handbrake cable

    The gas tank must be removed based on my search through old Previa Yahoo! Group messages (one of which was your same question posted by John Kaufmann who's a member here).

    As always, my...
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    Re: SADS question for those who have done it

    Another thought - you should see if the rubber (between the inner and outer parts) in your harmonic balancer has begun to fail, making it not-so-balanced and perhaps putting extra stress on that rear...
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    Re: SADS question for those who have done it

    I found this youtube video that may be what you're looking for. However, keep in mind you may be seriously stressing some old rubber mounts on the front part, and placing your hand and fingers in...
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    Re: Do I need a heater bypass valve?

    The heater valve cuts off flow to the heater core completely when closed- your temp fluctuations might be because of what you surmised about the heater acting as an auxiliary radiator, or perhaps you...
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    Re: Previa Rear Swaybar for sale

    I have some. Manuf. in 2021 by Addco, 1" bar, stock #472 with a #018 Endlink Kit. For the folks here, $197.17 plus UPS freight for your zip. The $197.17 recoups my original per-piece cost (unit...
  38. Sticky: Re: The WHAT-IS-THIS-PART and WHAT-IS-THE-PART-NUMBER Thread for Previas

    I've seen a decline in the level of detail on a lot of the Toyota parts sites, but this one still has the diagrams:
    https://parts.villagetoyota.com/
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    Re: The hose of death thread

    1992 Previa owner here. I don't think there's anything on the Previa with such catastrophic failure potential that's as hidden away from examination and replacement as the HOD is on the Vans.
  40. Re: Valve clearance - how much out of spec is actually bad?

    I'm appending this onto an old thread as it might be useful for more valve-adjustment info in one place. While doing something else, I just ran across a Previa valve adjustment spreadsheet I had once...
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    Re: Locations of ground points on Previa

    Previa Electrical Wiring Diagram - Location of Connectors and Ground Points
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    Re: front blower mystery-resistor bypass?

    Maybe this helps?
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    Re: front blower mystery-resistor bypass?

    and of course I'm talking going with the original harness to the fan housing
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    Re: front blower mystery-resistor bypass?

    [edited - screwed up the first time - my apologies]

    I agree you probably have a harness problem - your broken connection is probably between:

    the switch's "High" contact pin 8 and pin 4 of...
  45. Thread: ignition delay

    by man_btc
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    Re: ignition delay

    First guess would be the starter plunger. It is perhaps not moving freely such that it takes that 1/2s between the solenoid being energized and the plunger moving. (The plunger has a conductive ring...
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    Re: Previa stereo cuts out with other loads

    This may be more "data dump" than helpful advice, but...here's a copy of someone's notes and photos for a '95 sound system install (from poster "p_revia95" on the now-defunct Yahoo Group) plus a...
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    Re: Previa stereo cuts out with other loads

    You are correct, the brown wire in the Previa harness is ground - I was thinking of the colors I've seen on modern radio-side harnesses. where it's black.

    On my '92 I measured about half an ohm...
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    Re: Previa stereo cuts out with other loads

    IMO the likeliest culprit is a bad ground. I don't know what you mean by the brown ground wire being "consistent." Typically brown is for a dimmer connection or even a speaker, whereas the black wire...
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    Re: Roof rack rails question

    Sorry, the roof-mounted panels just immediately reminded me of a scene in the movie -
    https://www.youtube.com/watch?v=OADJl-CVDo0
    The plate's actually a rebus (suggests the sound of the word or...
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    Re: Roof rack rails question

    James, you so need to get a vanity plate that says GMIDCSH (Fifth Element reference) :yes:
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