Nothing turns on - ignition switch? - JeepForum.com

 
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post #1 of 13 Old 11-22-2013, 02:35 PM Thread Starter
Plyj
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Nothing turns on - ignition switch?

I've been having issues with my '90 YJ. It had intermittent starting problems after I replaced the intermediate steering column.
Sometimes it would start just fine and sometimes no starter but the dash lights & heater worked (I could jump across the starter with ignition key on and it started fine).

Now, no dash lights, no heater, no ignition... no nothing (starter turns over when jumped but won't start). I'm thinking ignition switch. Does that make sense? I've read a few write ups on replacing the switch so I'll probably do that as a first step.

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post #2 of 13 Old 11-22-2013, 04:57 PM
jbolty
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Good guess.

First, get a helper and a volt meter. Check the fusible links to make sure you're getting power to the fuse block; sometimes those burn partially. Also see if the power from the switch to the starter relay is working. Green wire, as I recall.

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post #3 of 13 Old 11-22-2013, 07:13 PM
Old4X
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As you just worked on the steering column, that is a good place to start.

hint: the electrical part of the ignition switch is on it.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #4 of 13 Old 11-23-2013, 02:56 PM
rubisean
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take the ignition switch off the column, manually work the switch with a small screwdriver. the spring loaded position is the start position. if that works then it is a simple matter of adjusting the switch
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post #5 of 13 Old 11-25-2013, 01:07 AM
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http://www.jeepforum.com/forum/f12/b...witch-1226376/

Just in case it helps.

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post #6 of 13 Old 11-28-2013, 06:08 AM Thread Starter
Plyj
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Well... it wasn't the ignition switch.
Swapped in a new one (nice write up Opihi) and still nothing.
Guess I'll have to trace it now.
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post #7 of 13 Old 12-02-2013, 08:26 AM
Que89YJ
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Get a meter and check the output of the ignition switch and the input at the starter relay.
Here are the links to download the FSM to trace the wires back:
http://dl.dropbox.com/u/40590346/87-88%20YJ%20Jeep%20Wrangler%20FSM%20manual.pdf
http://dl.dropbox.com/u/40590346/1990%20Jeep%20Factory%20Service%20Manual.pdf
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post #8 of 13 Old 12-02-2013, 09:24 AM
jaycal3
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May be a long shot but easy to check... I would look at the ground wire off the battery to the block. I had the same symptoms a while back and found that it was exactly that. Got new battery wires and terminals and installed and cleaned the area it attaches to the block for clean solid contact and voila.

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post #9 of 13 Old 12-02-2013, 09:34 AM
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No matter how long I live I'll never understand tossing parts at a problem with diagnosing it first.

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post #10 of 13 Old 12-02-2013, 10:16 AM
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Quote:
Originally Posted by jbolty View Post
No matter how long I live I'll never understand tossing parts at a problem with diagnosing it first.
But... a meter costs 10 bucks! The part was only $155.00 ...........

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #11 of 13 Old 12-02-2013, 07:57 PM Thread Starter
Plyj
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Put the column (w/ new switch) back together and looked at the starter relay (bolted to fire wall).
One wire (off the main pwr post) was smoked... looked like an old problem but jumpered across it anyway and got dash lights (also got pwr to starter relay).

That seemed encouraging so I shorted across starter... she started and ran perfectly.
Ordered a new starter relay (everything up to it else seemed fine) since that is the likely suspect.

No disrespect but it's often less time consuming (and cheaper) to toss parts at a problem than spend days tracing/diagnosing an issue... especially if the parts are cheap and time is limited (or you're working in the driveway and it's below freezing).
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post #12 of 13 Old 12-03-2013, 09:58 AM
Que89YJ
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I will give you the cold thing....but not cheaper!
Glad to hear you got it runnin'.
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post #13 of 13 Old 12-04-2013, 09:06 AM Thread Starter
Plyj
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I believe I've found the problem...
After I repaired the smoked wire (fused it w/ small fuse - 10A), I had instrument lights and, therefore, pwr to ignition coil.
It started fine and ran great (as always) but when I put the heater on full, the fuse pops (much better than burning more wire) leading me to suspect that everything (dash-wise) is on the same circuit.

Well, last summer I did the blower motor upgrade (older blazer motor fits great and delivers a hurricane of wind). I'm guessing the new motor pulls lots more current than the OEM and overloaded the circuit (don't know why junction box fuse didn't blow - maybe too big a fuse), smoking the wire. So, I ran a separate circuit (with relay & fuse) for the blower motor and haven't had any problems since.

Thanks everyone for the help... I'm happy !
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