Derekw66

New to group and an ABS problem with my 91TC

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 So, any help anyone can offer. I am new to the group but have had my TC for quite some time. Recently my ABS light and brake light on and I had no power brakes.  Upon inspecting the fuse box for the ABS, the 30 amp fuse was melted, as well as the fuse box. The accumulator is relatively new and does not run for more than 25 to 35 seconds so I can’t imagine it being the culprit. Does anybody have an idea as to why that wire got/gets so hot?   Also, it’s worth noting my battery goes dead within two days but I can’t see the drain anywhere.   I’ll add some pics of my findings.  Thank you in advance.   

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06BA6FEA-1C66-44BA-9CF9-382AE0EB5846.jpeg

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This is not an uncommon problem. If the accumulator is in fact OK, then the pump is pulling too much current. If that is the case, put an ammeter in the power circuit and connect directly to the battery and see what the current draw is to operate the pump.  We do find that this condition is usually due to a defective accumulator, though.

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Hello ;

I am also having a problem with my 1989 Car, 4 cyl, auto,TC draining the battery appox. every  two days. If you find out what is draining your battery , please let me know.

I have been chasing my problem for some time now, changed battery and brake accumulator with no help.

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Check your trunk and spare tire compartment lights and under the hood, they may be on all the time, mine were.

Edited by bilk
added info (see edit history)

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To add to the last suggestion, if you use a DVM, you can monitor the amp draw from the battery. Hook that up and start pulling fuses until the draw goes down. Then, start trouble shooting that circuit.

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  I'll do all of these recommendations and report back.  Heading to Indy for the weekend but I'll check back next week with some positive results hopefully. 

Thank you for the tips gtuys. 

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Well, I did a parasitic drop test on the system and found nothing.  My battery is at least 10 years old so I may just get a new one for good measure.  It may just nothold a charge very well anymore.  

  As for the abs fuse melting, I think it may be attributed to when I bled the rear brakes during my system flush two days prior to having the melted circuit.  In order to bleed the rear brakes (for those that don’t know) the abs has to be running constantly to push the fluid out.   I don’t think it had ever been done.  

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Yeah, a 10 year old battery is getting up there.

 

Agreed that if the ABS system is let run too long during that procedure it could cause issues. I think I remember there being a caution about how long to let it run?

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On 9/13/2018 at 12:35 AM, jderden said:

Hello ;

I am also having a problem with my 1989 Car, 4 cyl, auto,TC draining the battery appox. every  two days. If you find out what is draining your battery , please let me know.

I have been chasing my problem for some time now, changed battery and brake accumulator with no help.

I used to have the same problem - turns out it was the pull-down motor for the top. Use a 3/4" wrench on the manual override (in the trunk) to check that it's fully seated. If you hear a click, you'll know it's the problem.

John

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I would do a parasitic voltage drop test on your TC. I had the luxury of knowing which fuse melted, kinda easy to spot, and after seeing my battery was more than 10 years old, I,m Confident my problem is sorted.  No issues since my last post.  

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On 9/10/2018 at 11:42 AM, Derekw66 said:

 So, any help anyone can offer. I am new to the group but have had my TC for quite some time. Recently my ABS light and brake light on and I had no power brakes.  Upon inspecting the fuse box for the ABS, the 30 amp fuse was melted, as well as the fuse box. The accumulator is relatively new and does not run for more than 25 to 35 seconds so I can’t imagine it being the culprit. Does anybody have an idea as to why that wire got/gets so hot?   Also, it’s worth noting my battery goes dead within two days but I can’t see the drain anywhere.   I’ll add some pics of my findings.  Thank you in advance.   

B1C3EF79-8AFA-4D29-92F6-E2450A3FC6A0.jpeg

E82E0CF1-B760-44FB-900E-E8EBE395E776.jpeg

06BA6FEA-1C66-44BA-9CF9-382AE0EB5846.jpeg

 

Something I found on RockAuto which you should all take a look at if you need to do electrical repairs. The DORMAN 85665  Fuse Holder - Blade Style; 12 Gauge w/o Cap looks most promising for the ABS circuit repair.

WVE/AIRTEX/WELLS 6G1030 {#88922375, FH1}  Flat Type (ATO) Inline Fuse Holder -- 30 Amp (Includes Fuse) Two 4` leads.  Info
 
 
 
 
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Part image
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$4.67  
 
BUSSMANN HHX  MAXI-FUSE® In-line holder, fuse holder with cover, 20-60 amps, # 6 lead wire
 
 
 
 
 
$5.49  
 
DORMAN 85665  Fuse Holder - Blade Style; 12 Gauge w/o Cap  Info
 
 
 
 
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Part image
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$1.46  
 
DORMAN 84938  Fuse Holder - Blade Style; 16 Gauge - up to 20 Amps  Info
 
 
 
 
<
Part image
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$1.61  
 
DORMAN 84939  Fuse Holder - Blade Style; 14 Gauge Waterproof  Info
 
 
 
 
<
Part image
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$1.71  
 
DORMAN 85670  Fuse Holder - Blade Style; Mini Style  Info
 
 
 
 
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Part image
>
$3.68  
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