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1998 s70 reverse jump polarity troubleshooting. Bad relays Topic is solved

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Derbyrunner
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1998 s70 reverse jump polarity troubleshooting. Bad relays  Topic is solved

Post by Derbyrunner » Wed Aug 17, 2016 6:43 am

Ok so I bought a running and driving 1998 S70 turbo and had to use a loaner battery to get it started and test drive. Car ran with no issues. Get it home and my teenage son who I bought car for hooked up new battery backwards. Now engine will not even turn over and the 15 amp fuse blows as soon as key is turned on. Need help badly

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Re: Ignition fuse keeps blowing.

Post by cn90 » Wed Aug 17, 2016 8:34 am

This has been reported before (reverse hookup), search forum for solutions, I think it is about checking a whole bunch of fuses.
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abscate
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abscate

Re: Ignition fuse keeps blowing.

Post by abscate » Wed Aug 17, 2016 9:01 am

This usually takes out the voltage regulator on the back of the alternator. Its actually good that it does this as this can get much more expensive than this.
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Derbyrunner
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Re: Ignition fuse keeps blowing.

Post by Derbyrunner » Wed Aug 17, 2016 2:54 pm

abscate wrote:This usually takes out the voltage regulator on the back of the alternator. Its actually good that it does this as this can get much more expensive than this.
Is there a way to test voltage regulator?

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Re: Ignition fuse keeps blowing.

Post by Derbyrunner » Wed Aug 17, 2016 6:33 pm

Changed voltage regulator and car still blows ignition fuse.

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Re: Ignition fuse keeps blowing.

Post by abscate » Wed Aug 17, 2016 6:42 pm

Ugh. You will have to find the right wiring diagram on the inter webs and trace that fuse and all circuits on it to find the fault.
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Re: Ignition fuse keeps blowing.

Post by BEJinFbk » Wed Aug 17, 2016 8:32 pm

It would be helpful if you identified the fuse slot #.
'98 V70 R - Well Equipped for Life Up North... ;)

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Re: Ignition fuse keeps blowing.

Post by Derbyrunner » Thu Aug 18, 2016 4:56 pm

Fuse number 10

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Re: Ignition fuse keeps blowing.

Post by cn90 » Thu Aug 18, 2016 7:20 pm

Fuse #10 controls:
Ignition switch, Control modules - engine/automatic transmission 10 A

http://new.volvocars.com/ownersdocs/199 ... 70_102.htm

So it is down to:

1. A short in the wiring somewhere.
2. A short inside the ignition switch (which is extremely rare, almost unheard of).
3. A short inside the ECU, almost unheard of.

Please post a follow-up.
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BEJinFbk
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Re: Ignition fuse keeps blowing.

Post by BEJinFbk » Thu Aug 18, 2016 9:59 pm

That's the fuse that actually feeds the ignition switch itself.
From there it branches out to several things, including accessory
overload relays 105 and 106.
One way to deal with this is take a picture of the fuse box,
pull all of the other fuses and start putting them back one at
a time with the key on. Long way around, but it's a start.

This may help:
98 S-V70 Fuse Locations and Legends.pdf
(678.65 KiB) Downloaded 77 times
'98 V70 R - Well Equipped for Life Up North... ;)

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