Low beam headlights not working. 2.6l gas 1988

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Clam
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 10, 2020 3:48 am

I have a 1988 isuzu spacecab. 2.6 L gas. Automatic transmission. The low beams both right and left do not work. The high beams both work. The yellow turn signal on the passenger side works but not the driver side. The rear turn signal on the driver's side flashses fast. The rear passenger side turn signal blinks slowly.
Any suggestions?

Clam
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 10, 2020 3:51 am

I do not know how to remove the grill so I can remove the yellow cover over the driver side front turn signal. I was able to remove 3 screws from the yellow cover. But the cover will not come off. I have to look under the bumper area to try and find 4th screw. :(

Clam
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 10, 2020 3:54 am

The Parts Expert at Autozone thinks I either have 3 burnt out bulbs or a turn signal switch not working. The switch is $170, $220 or $260 at rock auto, autozone or amazon respectively.

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puttputtinpup
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Re: Low beam headlights not working. 2.6l gas 1988

Postby puttputtinpup » Mon Feb 10, 2020 6:55 am

Clam wrote:The Parts Expert at Autozone thinks I either have 3 burnt out bulbs or a turn signal switch not working. The switch is $170, $220 or $260 at rock auto, autozone or amazon respectively.

I've never owned an 88-85 truck but I've read quite a few cases here on the forum about those multiswitches going back. Some have removed them and cleaned the contacts inside somehow.

1st, check all fuses especially dealing with the headlights. Years ago i had a straight truck for work and both lowbeam bulbs went out at the same time. Unplug the bulb and chk for voltage at plug both high and low beam. Remember to switch the hi-beam lever yo check the other circuit. Or just low beam if you know which it is.

Flashing fast usually mean a bulb burned out or an element from inside the bulb burned and fell onto the parking light circuit element perhaps. A bad ground at any given bulb can cause weird electric gremlins.

Clam
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 10, 2020 7:24 pm

Thank you Putputinpup.

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swvaed
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Re: Low beam headlights not working. 2.6l gas 1988

Postby swvaed » Sun Feb 16, 2020 2:23 pm

Puttputt is right. I threw this post up quick because it will take me a little time to find a couple things. I used to have a diagram of the switch. I've cleaned a couple switches, not hard, but delicate. Where are you located?
92 Pickup 2.3 5spd Available/Parts/Salvage title
90 Long cab 2.6FI 5spd My project
87 PUP 1.9 4spd Available/Project/Parts/Clear title
74 VW Superbeetle Available/Clear title
61 VW Rail Available/Va. Street legal/Clear title
99 S10/DD
01 Jimmy/Better DD

Clam
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 17, 2020 5:18 am

Greenville, South Carolina.

I am 2 hours from Charlotte and Atlanta. 4 hours west of Charleston, South Carolina.

Clam
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 17, 2020 5:22 am

Before the low beams went out if I turned on a signal light to turn the low beams would sometimes blink off for 1/2 second like a loose wire bounced. Now the low beams just do not work at all. Last fix on the truck was replacing key cylinder right before low beams right and left stopped working.

Clam
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 17, 2020 5:24 am

Thanks for the quick post Swvaed.

Did you have to take the steering wheel off to clean the switch? I have both top and bottom covers that surround the switch off the steering wheel. I can see the switch.

Clam
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 17, 2020 5:35 am

UPDATE: I was able to remove the grill by pushing up on the black tabs on the top of the grill and two tabs on the bottom using a screw driver to poke up there from below. I also found one screw to unscrew that went through the grill to the post that supports the hood latch about 7 inches down from the latch. I replaced both front side yellow signal bulbs and they glow but do not blink when I use the turn signal clicker. I also had one burned out bulb on the yellow front bumper driver side light.

Clam
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 17, 2020 5:42 am

Autozone.com hyperlink below for Turn signal switch also known as dimmer switch for 1988 Isuzu Pickup 2.6 L gas. Automatic transmission.

https://m.autozone.com/electrical-and-l ... ?location=

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swvaed
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Re: Low beam headlights not working. 2.6l gas 1988

Postby swvaed » Mon Feb 17, 2020 1:21 pm

Yeah, from your first post it sounded like you may have multiple problems. Please don't be offended if I ask questions or talk below your level of knowledge, I just don't know you or what you know. I think the 88 through 95 pickups were very similar. Somebody jump in here if I'm off base. ( I have a 90 and a 92). Found a workshop manual over on Planet Isuzu for 94 and 95 you can download as PDF. Has electrical diagrams. Owners manual is 'How to Operate.' Workshop (or Repair) manual is 'How to Fix.' Worth its weight in gold.

https://forum.planetisuzoo.com/viewtopi ... 1&t=127009

Forget headlights for the moment, may or may not be a different problem.
Next, turn your 4 way Hazard lights on. Note whether they work. Then turn them on and off at least a dozen times. Turn signals get power through that part of the "Combination Switch" (Turn signal switch). This may help clean the tiny mechanical contacts inside the switch. Check and note any change in operation. Let us know.

Yes, the steering wheel has to come off to remove switch. But do the above before tearing anything apart.

I'm still looking for the cleaning procedure that was on here with pictures. Anyone know where it is?
92 Pickup 2.3 5spd Available/Parts/Salvage title
90 Long cab 2.6FI 5spd My project
87 PUP 1.9 4spd Available/Project/Parts/Clear title
74 VW Superbeetle Available/Clear title
61 VW Rail Available/Va. Street legal/Clear title
99 S10/DD
01 Jimmy/Better DD

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swvaed
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Location: Roanoke, Va. 30 minutes north
Isuzu vehicle(s): 1990 Pickup long cab 5 speed

Re: Low beam headlights not working. 2.6l gas 1988

Postby swvaed » Mon Feb 17, 2020 1:32 pm

Sorry. If you're absolutely new to this, I forgot to add a little encouragement along with the tech. You can beat this. When I was quoted $175 for the switch for my 92, I 'Fixed' it with a $5 toggle switch mounted on the floor shift. Loved being able to switch turn signals with my right hand while shifting and still steering with my left.
92 Pickup 2.3 5spd Available/Parts/Salvage title
90 Long cab 2.6FI 5spd My project
87 PUP 1.9 4spd Available/Project/Parts/Clear title
74 VW Superbeetle Available/Clear title
61 VW Rail Available/Va. Street legal/Clear title
99 S10/DD
01 Jimmy/Better DD

Clam
Regular Member
Posts: 34
Joined: Thu Jan 30, 2020 10:12 pm
Location: Confidential
Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 17, 2020 7:11 pm

Swvaed, Cool. I thought about a toggle switch just for the low beams too to forego a $200.00 parts and labor job. I found a seller with a $120.00 new OEM turn signal/dimmer switch and $80.00 for a electric automotive repair shop to do the labor. I drove the truck for 9 years and spent very little time and money in maintenance for 9 years of driving. So the $200 does not look bad but still hurts. Some jobs I can do myself but sometimes I prefer an experienced person. Who can do in 45 minutes what might take me 3 hours plus one mistake adding 2 to 5 hours or burned up electrical system. I put transmission fluid in my oil tube on a 1980 something dodge k car station wagon. I left the oil cap off my 1987 isuzu pup engine one day oil all over the bottom of the hood with smoking oil too. I forgive myself for those mistakes and hate to pay for honest labor at the 80 dollar mark but sometimes 80 spent is better than 75 hours lost. :)
Last edited by Clam on Mon Feb 17, 2020 7:21 pm, edited 3 times in total.

Clam
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Posts: 34
Joined: Thu Jan 30, 2020 10:12 pm
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Isuzu vehicle(s): 1988 Isuzu Spacecab 2.6 L Gas.

Re: Low beam headlights not working. 2.6l gas 1988

Postby Clam » Mon Feb 17, 2020 7:17 pm

UPDATE: I paid $15.00 to an automotive electrical repair shop today and the mechanic stated he believes but does not guarantee the dimmer switch is the culprit and to start there with replacement.

I am going to try and clean the contacts on the installed switch and order a new one if cleaning does not work.