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Shibby_cbs

Member Since 20 Jan 2020
Offline Last Active Aug 31 2021 08:00 AM
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Posts I've Made

In Topic: 1987 Crx Si Honda Civic Blinker Turn Signal Fluctuates With Rpm

18 November 2020 - 10:53 AM

perfectly normal for battery volts to drop as you load more current w accessories turned on. google v=ir equation in a physics lecture

when the alt is running, the regulator keeps the volts steady around 14-14.5vdc

my blinker always causes my fuel pump to hum in rhythmic iscillation as my blinker goes now that i think of it. must be a response time thing on the regulator built into the alt.

turn ur headlights one at idle, engine slows, then speeds up again as the regulator corrects for amp draw

i replaced my oem alt last year w another lower mileage denso oem 1987 alt. my fuel pump still hums the same when blinkers run at idle. i still have the original 260k fuel pump in the car. if u have an aftermarket, or larger pump, it will draw more amps and i’d assume the humming oscillation would be more noticeable

when working on my other cars, i notice after cleaning the fuel pump filter sock in the pump, not the tank, the humming quiets down

suggest u start another post on the other electrical issue ur having. purpose of this post was to highlight the strange issue noticed as a light bulb was on verge of failing. i recall reading consumer reports years ago. they rated electrical system on these cars to be poor. i’ve not had any unnormal issues w this car since 1993 up until now

keep us posted if u figure it out

 

Definitely agree with you here. The only thing is that it seems to be much more dramatic on that specific circuit. There are a few interesting things I have discovered since. While I do get voltage drop with any added load it is much more pronounced when using the turn signals and reverse lights specifically. Looking at the fuse panel they share a fuse. The other interesting thing is that when I turn on the hazards they do not cause the significant voltage drop that the turn signals do. Considering they use the same lights and relay thats a significant detail. Just looking at that it seems like the uncommon denominator would me the multifunction switch. The other thing I didnt really consider was that the fuel pump itself might be the thing that is putting the high load on the system and the signals might just be putting it over the edge. I have since changed out my fuel pump for a new Bosch unit and the difference has been mind blowing. I can no longer even hear the pump turn on when I flip the key in the morning. The only reason I know it has turned on is because the new pulsation damer I installed on the pump vibrates with the initial burst of fuel. There also seems to be less of a load on the system but I have yet to actually verify that. I can say that I no longer hear or see any effect on the car when the signals are on though maybe still a slight difference in idle stability which I am still trying to sort out. 


In Topic: 1987 Crx Si Honda Civic Blinker Turn Signal Fluctuates With Rpm

23 October 2020 - 06:41 PM

Yea thats definitely weird but a bit different than my issue. My blinkers run at a constant rate so dont think there is an issue with that circuit as far as the bulb and wires go. Had a look at the fuse box and everything seemed just fine as far as there being no obvious hot spots causing damage.

A little background on my car if it helps. Before I got the car it had sat in a gravel lot for about 6-7 years and from what I could tell somewhere else for another 3 or so. It had 77,000 miles on it when I got it about 10 months ago and have put another 1,000 on it. To get the car running was essentially a matter of repairing a couple wires under the hood and taping into the fuel pumps ground just where it comes into the car from around the back of the gas tank. The rear half of the harness that powers all the rear lighting and wiper and also includes the fuel pump ground was chewed to peices from squirrels. I later on rebuilt that harness with soldered and heat shrinked connections with the proper size wire. From everything I can tell the wiring is perfectly adequate in that area of the car so I don't really think the issue is there. That being said I found out recently that between the main relay out to the pump and the pump +/- posts I am losing an entire volt. Keep in mind whether its running with that lost volt or running straight off the battery it still changes tone significantly and drops volts with the signals on and only slightly with things like headlights and reverse lights. The alternator is brand new as well but the battery is used but seems just fine as far as daily use starting of the car goes.

With it having sat so long is it possible that a good portion of the relays have contacts that are maybe glazed over or corroded causing a spike in amp draw? At this point it is the only thing I can think of though I'm no electrical system expert and am sure there are more things to consider. What do you guys think?

In Topic: 1987 Crx Si Honda Civic Blinker Turn Signal Fluctuates With Rpm

22 October 2020 - 01:50 PM

Very odd sounds like ground issues. I have a Waldro 255 fuel pump and no issue like that.

 

Very odd indeed. My pump is low on voltage as well. When I provide a ground straight to the battery the voltage does not increase and also does not cure the tone change issue when adding load to the system (voltage drop). I also ran both positive and negative direct from the battery to the pump terminals and this got me the proper voltage but it would still change tone with load. I feel like something is drawing too many amps that is effecting the entire system but its hard to say. The blinkers have the biggest effect by far. Also just like greasemonkey my car runs rough with increased system load but I mainly only notice it at idle.


In Topic: 1987 Crx Si Honda Civic Blinker Turn Signal Fluctuates With Rpm

21 October 2020 - 10:02 AM

I'm experiencing a similar issue with my fuel pump. Fluctuates with wipers as well as turn signals and headlights. Checked voltage at the pump and it's dropping below 12v with the headlights on and the blinker on without the car running. Not a ground issue either as I grounded it straight to the battery and am having the same issue. Think I might try freshening up the solder on the main relay next. Not sure where else to look from there. 


In Topic: We're Back!

04 February 2020 - 02:34 PM

Hey everybody! New guy here who picked up his 1st gen while the site was down. Kind of reminds me of when I graduated from tech school right in the middle of the 08 recession. Clearly I have great timing. Anyway I'm happy to see the site is back up in some capacity. Will all of the old posts get uploaded at some point as well?