Connected a new battery in backwards

Tiny
95_RODEO
  • MEMBER
  • 1995 ISUZU RODEO
  • 3.2L
  • V6
  • 4WD
  • AUTOMATIC
  • 183,000 MILES
So basically, my old battery could not stand the cold and was not charging, so I bought a brand new one but accidentally hooked the (negative) and (positive) backwards. As soon as I did it sparked. It did not seem right. So I went into my car and turned the ignition and nothing worked, no dash lights, nothing. So I checked the fusebox and every single fuse was intact except for the main 100A fuse, which was blown. I bought a new one and replaced it. I tried to start it again, this time. All the dash lights came on and I could hear the sound of the fuel pump pressurizing. The clock did not come on however, neither did the interior lights. I turned the ignition and it cranked, but no combustion! It turns but it does not start. There is fuel and air. I checked the spark plugs and they are not getting any power. They have no spark. So now I am baffled at what to do next. What is broken, and what do I need to fix? Thank you.
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Saturday, December 24th, 2016 AT 9:23 PM

8 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
Check your fuses!

If that is not the ticket, you probably fried a fusible link.

The Medic
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Saturday, December 24th, 2016 AT 9:27 PM
Tiny
95_RODEO
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All fuses are good, how would I check a fusible link to see if it is broken?
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Saturday, December 24th, 2016 AT 9:28 PM
Tiny
CJ MEDEVAC
  • MECHANIC
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I sort of winged the link, most vehicles have them. (Seems I do not see one in the diagrams)

I am looking at your starting/ charging diagram as you responded.

I have two diagrams-Early Production and Late Production.

Early check Main Fuse 1, 50 amp in the relay box.

Late check Fuse 16, 100 amp in the relay box.

Sometimes your battery connections are what takes the hit, check the cable connections on both ends of the cables, and where they connect to the battery.

Keep me posted, it is almost bedtime! Wife already has visions of sugar plums in her head.

The Medic
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Saturday, December 24th, 2016 AT 9:40 PM
Tiny
CJ MEDEVAC
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More checks

check fuses 3 and 7 both are 15 amp Dash fuse box and fuse 6, 10 amp in the fuse/ relay box

also fuse 11, 10 amp in the dash fuse box.

I also see "Diode Box A" and "Diode Box B" in the fuse relay box.

Any progress?

The Medic
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Saturday, December 24th, 2016 AT 9:56 PM
Tiny
95_RODEO
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Thank you man, I will check those out! I appreciate your response. I will follow up tomorrow. Got to keep that wife happy you know.
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Saturday, December 24th, 2016 AT 10:17 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
Let us know how it goes.

Merry Christmas!

The Medic
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Saturday, December 24th, 2016 AT 10:20 PM
Tiny
95_RODEO
  • MEMBER
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Nice Jeep you got there. Where did you dig that up? Looks pretty antique! Update: it is the ignition coil, I replaced the fuse and it starts right up. I swear I checked every fuse but I guess I am a bad looker. The clock and stereo still do not work and the interior lights will not turn on. The fuses for those are fine however so I do not know what the problem is there. I intend on getting a new bluetooth stereo anyways.
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Sunday, December 25th, 2016 AT 9:01 AM
Tiny
CJ MEDEVAC
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I have two Jeeps, the 1977 CJ-5 (Mr. Jeep) is my primary transportation. (had five others prior, never anything else since I was allowed on the asphalt).

The 1946 Willys (Willy) is my baby, I drive him every chance I get.

I made one car payment for each one back in 1991. Mr. Jeep was $2,200.00 and I gave $100.00 for Willy's heart and soul, Two years and many side jobs later (play money) he was on the road too!

Posting a picture of the day he was rescued. The first picture actually looks decent (In reality this was the bait that lured me in). The body was held together with splatter welds and a fifty five gallon drum of bondo. It had to go, I pretty much started from scratch to revive him.

Fuse testing kind of the easy way, see this you tube video.

https://www.youtube.com/watch?v=gKgmIcmp7eo

Audio Fuse CB-19 (15 amp),

Room Fuse CB-9 (10 amp) (memory),

Both in the dash fuse box dealing with the radio,

Interior lights CB-9 Room Fuse (Same as the radio),

Also in the lighting diagram,

Diode Box F ,

Diode Box G,

Both are in the Dash fuse box left of the instrument panel,

I figure the stuff I listed above are things that coulda took the surge. Other than that, everything else is lights or switches,

After you see the video, insure you have power on both sides of the fuses, your key may need to be on.

Glad it is driving!

Need more information just ask.

The Medic
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Sunday, December 25th, 2016 AT 5:14 PM

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