Blown fuse

SARAHCLAAR79

MEMBER
1999 PONTIAC MONTANA

I have a 1999 Pontiac Montana, and had to replace a blown Maxi fuse for the ignition, it started up after replacing it but upon starting agin it blows the fuse again. Why?

Tuesday, March 22nd, 2011 AT 5:15 PM

8 Replies

JDL

MECHANIC
16,098 POSTS

I saw two ignition maxi fuses. What is the amp rating?

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Tuesday, March 22nd, 2011 AT 6:40 PM

SARAHCLAAR79

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The maxi fuse has 40A on it and on the cover for the box under the hood.I have checked all other fuses that are in the door as well. Have also replaced the ignition relay since my first question, and it stared and ran one time after turning the vechile back off, no start again

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Thursday, March 24th, 2011 AT 7:58 PM

JDL

MECHANIC
16,098 POSTS

Are you saying that same fuse is blown again? I did look at ignition switch wiring. Looked at the feed from that maxi fuse, your talking about. The smaller circuits from the ignition switch, served by the maxi fuse, all are controled by smaller fuses. It should blow smaller fuse first. Unless the problem is before the smaller fuse. All the smaller fuses add up to close to 100 amps. You can check amp draw on smaller fuses. Like hunting a needle in a haystack. Any applicable codes?

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Thursday, March 24th, 2011 AT 8:47 PM

SARAHCLAAR79

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6 POSTS

Yes the same fuse is blowing everytime.I dont know what you mean by "codes".I have went back and check all the other fuses again and all look good. Even the one that was blowing before? So now I am back 2 square ONE! Ugh. Lol

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Friday, March 25th, 2011 AT 5:25 PM

JDL

MECHANIC
16,098 POSTS

I was talking about trouble codes. To access those, at the least, you need an obd 2 code reader. It plugs into your datalink connector.

I'd have to check amp draw at the ignition switch. Does the connector look ok? Anything burned or melted?